var/SymfonyRequirements.php

   1 <?php
   2
   3 /*
   4  * This file is part of the Symfony package.
   5  *
   6  * (c) Fabien Potencier <fabien@symfony.com>
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 /*
  13  * Users of PHP 5.2 should be able to run the requirements checks.
  14  * This is why the file and all classes must be compatible with PHP 5.2+
  15  * (e.g. not using namespaces and closures).
  16  *
  17  * ************** CAUTION **************
  18  *
  19  * DO NOT EDIT THIS FILE as it will be overridden by Composer as part of
  20  * the installation/update process. The original file resides in the
  21  * SensioDistributionBundle.
  22  *
  23  * ************** CAUTION **************
  24  */
  25
  26 /**
  27  * Represents a single PHP requirement, e.g. an installed extension.
  28  * It can be a mandatory requirement or an optional recommendation.
  29  * There is a special subclass, named PhpIniRequirement, to check a php.ini configuration.
  30  *
  31  * @author Tobias Schultze <http://tobion.de>
  32  */
  33 class Requirement
  34 {
  35     private $fulfilled;
  36     private $testMessage;
  37     private $helpText;
  38     private $helpHtml;
  39     private $optional;
  40
  41     /**
  42      * Constructor that initializes the requirement.
  43      *
  44      * @param bool        $fulfilled   Whether the requirement is fulfilled
  45      * @param string      $testMessage The message for testing the requirement
  46      * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
  47      * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
  48      * @param bool        $optional    Whether this is only an optional recommendation not a mandatory requirement
  49      */
  50     public function __construct($fulfilled, $testMessage, $helpHtml, $helpText = null, $optional = false)
  51     {
  52         $this->fulfilled = (bool) $fulfilled;
  53         $this->testMessage = (string) $testMessage;
  54         $this->helpHtml = (string) $helpHtml;
  55         $this->helpText = null === $helpText ? strip_tags($this->helpHtml) : (string) $helpText;
  56         $this->optional = (bool) $optional;
  57     }
  58
  59     /**
  60      * Returns whether the requirement is fulfilled.
  61      *
  62      * @return bool true if fulfilled, otherwise false
  63      */
  64     public function isFulfilled()
  65     {
  66         return $this->fulfilled;
  67     }
  68
  69     /**
  70      * Returns the message for testing the requirement.
  71      *
  72      * @return string The test message
  73      */
  74     public function getTestMessage()
  75     {
  76         return $this->testMessage;
  77     }
  78
  79     /**
  80      * Returns the help text for resolving the problem.
  81      *
  82      * @return string The help text
  83      */
  84     public function getHelpText()
  85     {
  86         return $this->helpText;
  87     }
  88
  89     /**
  90      * Returns the help text formatted in HTML.
  91      *
  92      * @return string The HTML help
  93      */
  94     public function getHelpHtml()
  95     {
  96         return $this->helpHtml;
  97     }
  98
  99     /**
 100      * Returns whether this is only an optional recommendation and not a mandatory requirement.
 101      *
 102      * @return bool true if optional, false if mandatory
 103      */
 104     public function isOptional()
 105     {
 106         return $this->optional;
 107     }
 108 }
 109
 110 /**
 111  * Represents a PHP requirement in form of a php.ini configuration.
 112  *
 113  * @author Tobias Schultze <http://tobion.de>
 114  */
 115 class PhpIniRequirement extends Requirement
 116 {
 117     /**
 118      * Constructor that initializes the requirement.
 119      *
 120      * @param string        $cfgName           The configuration name used for ini_get()
 121      * @param bool|callback $evaluation        Either a boolean indicating whether the configuration should evaluate to true or false,
 122      *                                         or a callback function receiving the configuration value as parameter to determine the fulfillment of the requirement
 123      * @param bool          $approveCfgAbsence If true the Requirement will be fulfilled even if the configuration option does not exist, i.e. ini_get() returns false.
 124      *                                         This is helpful for abandoned configs in later PHP versions or configs of an optional extension, like Suhosin.
 125      *                                         Example: You require a config to be true but PHP later removes this config and defaults it to true internally.
 126      * @param string|null   $testMessage       The message for testing the requirement (when null and $evaluation is a boolean a default message is derived)
 127      * @param string|null   $helpHtml          The help text formatted in HTML for resolving the problem (when null and $evaluation is a boolean a default help is derived)
 128      * @param string|null   $helpText          The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 129      * @param bool          $optional          Whether this is only an optional recommendation not a mandatory requirement
 130      */
 131     public function __construct($cfgName, $evaluation, $approveCfgAbsence = false, $testMessage = null, $helpHtml = null, $helpText = null, $optional = false)
 132     {
 133         $cfgValue = ini_get($cfgName);
 134
 135         if (is_callable($evaluation)) {
 136             if (null === $testMessage || null === $helpHtml) {
 137                 throw new InvalidArgumentException('You must provide the parameters testMessage and helpHtml for a callback evaluation.');
 138             }
 139
 140             $fulfilled = call_user_func($evaluation, $cfgValue);
 141         } else {
 142             if (null === $testMessage) {
 143                 $testMessage = sprintf('%s %s be %s in php.ini',
 144                     $cfgName,
 145                     $optional ? 'should' : 'must',
 146                     $evaluation ? 'enabled' : 'disabled'
 147                 );
 148             }
 149
 150             if (null === $helpHtml) {
 151                 $helpHtml = sprintf('Set <strong>%s</strong> to <strong>%s</strong> in php.ini<a href="#phpini">*</a>.',
 152                     $cfgName,
 153                     $evaluation ? 'on' : 'off'
 154                 );
 155             }
 156
 157             $fulfilled = $evaluation == $cfgValue;
 158         }
 159
 160         parent::__construct($fulfilled || ($approveCfgAbsence && false === $cfgValue), $testMessage, $helpHtml, $helpText, $optional);
 161     }
 162 }
 163
 164 /**
 165  * A RequirementCollection represents a set of Requirement instances.
 166  *
 167  * @author Tobias Schultze <http://tobion.de>
 168  */
 169 class RequirementCollection implements IteratorAggregate
 170 {
 171     /**
 172      * @var Requirement[]
 173      */
 174     private $requirements = array();
 175
 176     /**
 177      * Gets the current RequirementCollection as an Iterator.
 178      *
 179      * @return Traversable A Traversable interface
 180      */
 181     public function getIterator()
 182     {
 183         return new ArrayIterator($this->requirements);
 184     }
 185
 186     /**
 187      * Adds a Requirement.
 188      *
 189      * @param Requirement $requirement A Requirement instance
 190      */
 191     public function add(Requirement $requirement)
 192     {
 193         $this->requirements[] = $requirement;
 194     }
 195
 196     /**
 197      * Adds a mandatory requirement.
 198      *
 199      * @param bool        $fulfilled   Whether the requirement is fulfilled
 200      * @param string      $testMessage The message for testing the requirement
 201      * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
 202      * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 203      */
 204     public function addRequirement($fulfilled, $testMessage, $helpHtml, $helpText = null)
 205     {
 206         $this->add(new Requirement($fulfilled, $testMessage, $helpHtml, $helpText, false));
 207     }
 208
 209     /**
 210      * Adds an optional recommendation.
 211      *
 212      * @param bool        $fulfilled   Whether the recommendation is fulfilled
 213      * @param string      $testMessage The message for testing the recommendation
 214      * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
 215      * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 216      */
 217     public function addRecommendation($fulfilled, $testMessage, $helpHtml, $helpText = null)
 218     {
 219         $this->add(new Requirement($fulfilled, $testMessage, $helpHtml, $helpText, true));
 220     }
 221
 222     /**
 223      * Adds a mandatory requirement in form of a php.ini configuration.
 224      *
 225      * @param string        $cfgName           The configuration name used for ini_get()
 226      * @param bool|callback $evaluation        Either a boolean indicating whether the configuration should evaluate to true or false,
 227      *                                         or a callback function receiving the configuration value as parameter to determine the fulfillment of the requirement
 228      * @param bool          $approveCfgAbsence If true the Requirement will be fulfilled even if the configuration option does not exist, i.e. ini_get() returns false.
 229      *                                         This is helpful for abandoned configs in later PHP versions or configs of an optional extension, like Suhosin.
 230      *                                         Example: You require a config to be true but PHP later removes this config and defaults it to true internally.
 231      * @param string        $testMessage       The message for testing the requirement (when null and $evaluation is a boolean a default message is derived)
 232      * @param string        $helpHtml          The help text formatted in HTML for resolving the problem (when null and $evaluation is a boolean a default help is derived)
 233      * @param string|null   $helpText          The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 234      */
 235     public function addPhpIniRequirement($cfgName, $evaluation, $approveCfgAbsence = false, $testMessage = null, $helpHtml = null, $helpText = null)
 236     {
 237         $this->add(new PhpIniRequirement($cfgName, $evaluation, $approveCfgAbsence, $testMessage, $helpHtml, $helpText, false));
 238     }
 239
 240     /**
 241      * Adds an optional recommendation in form of a php.ini configuration.
 242      *
 243      * @param string        $cfgName           The configuration name used for ini_get()
 244      * @param bool|callback $evaluation        Either a boolean indicating whether the configuration should evaluate to true or false,
 245      *                                         or a callback function receiving the configuration value as parameter to determine the fulfillment of the requirement
 246      * @param bool          $approveCfgAbsence If true the Requirement will be fulfilled even if the configuration option does not exist, i.e. ini_get() returns false.
 247      *                                         This is helpful for abandoned configs in later PHP versions or configs of an optional extension, like Suhosin.
 248      *                                         Example: You require a config to be true but PHP later removes this config and defaults it to true internally.
 249      * @param string        $testMessage       The message for testing the requirement (when null and $evaluation is a boolean a default message is derived)
 250      * @param string        $helpHtml          The help text formatted in HTML for resolving the problem (when null and $evaluation is a boolean a default help is derived)
 251      * @param string|null   $helpText          The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 252      */
 253     public function addPhpIniRecommendation($cfgName, $evaluation, $approveCfgAbsence = false, $testMessage = null, $helpHtml = null, $helpText = null)
 254     {
 255         $this->add(new PhpIniRequirement($cfgName, $evaluation, $approveCfgAbsence, $testMessage, $helpHtml, $helpText, true));
 256     }
 257
 258     /**
 259      * Adds a requirement collection to the current set of requirements.
 260      *
 261      * @param RequirementCollection $collection A RequirementCollection instance
 262      */
 263     public function addCollection(RequirementCollection $collection)
 264     {
 265         $this->requirements = array_merge($this->requirements, $collection->all());
 266     }
 267
 268     /**
 269      * Returns both requirements and recommendations.
 270      *
 271      * @return Requirement[]
 272      */
 273     public function all()
 274     {
 275         return $this->requirements;
 276     }
 277
 278     /**
 279      * Returns all mandatory requirements.
 280      *
 281      * @return Requirement[]
 282      */
 283     public function getRequirements()
 284     {
 285         $array = array();
 286         foreach ($this->requirements as $req) {
 287             if (!$req->isOptional()) {
 288                 $array[] = $req;
 289             }
 290         }
 291
 292         return $array;
 293     }
 294
 295     /**
 296      * Returns the mandatory requirements that were not met.
 297      *
 298      * @return Requirement[]
 299      */
 300     public function getFailedRequirements()
 301     {
 302         $array = array();
 303         foreach ($this->requirements as $req) {
 304             if (!$req->isFulfilled() && !$req->isOptional()) {
 305                 $array[] = $req;
 306             }
 307         }
 308
 309         return $array;
 310     }
 311
 312     /**
 313      * Returns all optional recommendations.
 314      *
 315      * @return Requirement[]
 316      */
 317     public function getRecommendations()
 318     {
 319         $array = array();
 320         foreach ($this->requirements as $req) {
 321             if ($req->isOptional()) {
 322                 $array[] = $req;
 323             }
 324         }
 325
 326         return $array;
 327     }
 328
 329     /**
 330      * Returns the recommendations that were not met.
 331      *
 332      * @return Requirement[]
 333      */
 334     public function getFailedRecommendations()
 335     {
 336         $array = array();
 337         foreach ($this->requirements as $req) {
 338             if (!$req->isFulfilled() && $req->isOptional()) {
 339                 $array[] = $req;
 340             }
 341         }
 342
 343         return $array;
 344     }
 345
 346     /**
 347      * Returns whether a php.ini configuration is not correct.
 348      *
 349      * @return bool php.ini configuration problem?
 350      */
 351     public function hasPhpIniConfigIssue()
 352     {
 353         foreach ($this->requirements as $req) {
 354             if (!$req->isFulfilled() && $req instanceof PhpIniRequirement) {
 355                 return true;
 356             }
 357         }
 358
 359         return false;
 360     }
 361
 362     /**
 363      * Returns the PHP configuration file (php.ini) path.
 364      *
 365      * @return string|false php.ini file path
 366      */
 367     public function getPhpIniConfigPath()
 368     {
 369         return get_cfg_var('cfg_file_path');
 370     }
 371 }
 372
 373 /**
 374  * This class specifies all requirements and optional recommendations that
 375  * are necessary to run the Symfony Standard Edition.
 376  *
 377  * @author Tobias Schultze <http://tobion.de>
 378  * @author Fabien Potencier <fabien@symfony.com>
 379  */
 380 class SymfonyRequirements extends RequirementCollection
 381 {
 382     const LEGACY_REQUIRED_PHP_VERSION = '5.3.3';
 383     const REQUIRED_PHP_VERSION = '5.5.9';
 384
 385     /**
 386      * Constructor that initializes the requirements.
 387      */
 388     public function __construct()
 389     {
 390         /* mandatory requirements follow */
 391
 392         $installedPhpVersion = PHP_VERSION;
 393         $requiredPhpVersion = $this->getPhpRequiredVersion();
 394
 395         $this->addRecommendation(
 396             $requiredPhpVersion,
 397             'Vendors should be installed in order to check all requirements.',
 398             'Run the <code>composer install</code> command.',
 399             'Run the "composer install" command.'
 400         );
 401
 402         if (false !== $requiredPhpVersion) {
 403             $this->addRequirement(
 404                 version_compare($installedPhpVersion, $requiredPhpVersion, '>='),
 405                 sprintf('PHP version must be at least %s (%s installed)', $requiredPhpVersion, $installedPhpVersion),
 406                 sprintf('You are running PHP version "<strong>%s</strong>", but Symfony needs at least PHP "<strong>%s</strong>" to run.
 407                 Before using Symfony, upgrade your PHP installation, preferably to the latest version.',
 408                     $installedPhpVersion, $requiredPhpVersion),
 409                 sprintf('Install PHP %s or newer (installed version is %s)', $requiredPhpVersion, $installedPhpVersion)
 410             );
 411         }
 412
 413         $this->addRequirement(
 414             version_compare($installedPhpVersion, '5.3.16', '!='),
 415             'PHP version must not be 5.3.16 as Symfony won\'t work properly with it',
 416             'Install PHP 5.3.17 or newer (or downgrade to an earlier PHP version)'
 417         );
 418
 419         $this->addRequirement(
 420             is_dir(__DIR__.'/../vendor/composer'),
 421             'Vendor libraries must be installed',
 422             'Vendor libraries are missing. Install composer following instructions from <a href="http://getcomposer.org/">http://getcomposer.org/</a>. '.
 423                 'Then run "<strong>php composer.phar install</strong>" to install them.'
 424         );
 425
 426         $cacheDir = is_dir(__DIR__.'/../var/cache') ? __DIR__.'/../var/cache' : __DIR__.'/cache';
 427
 428         $this->addRequirement(
 429             is_writable($cacheDir),
 430             'app/cache/ or var/cache/ directory must be writable',
 431             'Change the permissions of either "<strong>app/cache/</strong>" or  "<strong>var/cache/</strong>" directory so that the web server can write into it.'
 432         );
 433
 434         $logsDir = is_dir(__DIR__.'/../var/logs') ? __DIR__.'/../var/logs' : __DIR__.'/logs';
 435
 436         $this->addRequirement(
 437             is_writable($logsDir),
 438             'app/logs/ or var/logs/ directory must be writable',
 439             'Change the permissions of either "<strong>app/logs/</strong>" or  "<strong>var/logs/</strong>" directory so that the web server can write into it.'
 440         );
 441
 442         if (version_compare($installedPhpVersion, '7.0.0', '<')) {
 443             $this->addPhpIniRequirement(
 444                 'date.timezone', true, false,
 445                 'date.timezone setting must be set',
 446                 'Set the "<strong>date.timezone</strong>" setting in php.ini<a href="#phpini">*</a> (like Europe/Paris).'
 447             );
 448         }
 449
 450         if (false !== $requiredPhpVersion && version_compare($installedPhpVersion, $requiredPhpVersion, '>=')) {
 451             $this->addRequirement(
 452                 in_array(@date_default_timezone_get(), DateTimeZone::listIdentifiers(), true),
 453                 sprintf('Configured default timezone "%s" must be supported by your installation of PHP', @date_default_timezone_get()),
 454                 'Your default timezone is not supported by PHP. Check for typos in your <strong>php.ini</strong> file and have a look at the list of deprecated timezones at <a href="http://php.net/manual/en/timezones.others.php">http://php.net/manual/en/timezones.others.php</a>.'
 455             );
 456         }
 457
 458         $this->addRequirement(
 459             function_exists('iconv'),
 460             'iconv() must be available',
 461             'Install and enable the <strong>iconv</strong> extension.'
 462         );
 463
 464         $this->addRequirement(
 465             function_exists('json_encode'),
 466             'json_encode() must be available',
 467             'Install and enable the <strong>JSON</strong> extension.'
 468         );
 469
 470         $this->addRequirement(
 471             function_exists('session_start'),
 472             'session_start() must be available',
 473             'Install and enable the <strong>session</strong> extension.'
 474         );
 475
 476         $this->addRequirement(
 477             function_exists('ctype_alpha'),
 478             'ctype_alpha() must be available',
 479             'Install and enable the <strong>ctype</strong> extension.'
 480         );
 481
 482         $this->addRequirement(
 483             function_exists('token_get_all'),
 484             'token_get_all() must be available',
 485             'Install and enable the <strong>Tokenizer</strong> extension.'
 486         );
 487
 488         $this->addRequirement(
 489             function_exists('simplexml_import_dom'),
 490             'simplexml_import_dom() must be available',
 491             'Install and enable the <strong>SimpleXML</strong> extension.'
 492         );
 493
 494         if (function_exists('apc_store') && ini_get('apc.enabled')) {
 495             if (version_compare($installedPhpVersion, '5.4.0', '>=')) {
 496                 $this->addRequirement(
 497                     version_compare(phpversion('apc'), '3.1.13', '>='),
 498                     'APC version must be at least 3.1.13 when using PHP 5.4',
 499                     'Upgrade your <strong>APC</strong> extension (3.1.13+).'
 500                 );
 501             } else {
 502                 $this->addRequirement(
 503                     version_compare(phpversion('apc'), '3.0.17', '>='),
 504                     'APC version must be at least 3.0.17',
 505                     'Upgrade your <strong>APC</strong> extension (3.0.17+).'
 506                 );
 507             }
 508         }
 509
 510         $this->addPhpIniRequirement('detect_unicode', false);
 511
 512         if (extension_loaded('suhosin')) {
 513             $this->addPhpIniRequirement(
 514                 'suhosin.executor.include.whitelist',
 515                 create_function('$cfgValue', 'return false !== stripos($cfgValue, "phar");'),
 516                 false,
 517                 'suhosin.executor.include.whitelist must be configured correctly in php.ini',
 518                 'Add "<strong>phar</strong>" to <strong>suhosin.executor.include.whitelist</strong> in php.ini<a href="#phpini">*</a>.'
 519             );
 520         }
 521
 522         if (extension_loaded('xdebug')) {
 523             $this->addPhpIniRequirement(
 524                 'xdebug.show_exception_trace', false, true
 525             );
 526
 527             $this->addPhpIniRequirement(
 528                 'xdebug.scream', false, true
 529             );
 530
 531             $this->addPhpIniRecommendation(
 532                 'xdebug.max_nesting_level',
 533                 create_function('$cfgValue', 'return $cfgValue > 100;'),
 534                 true,
 535                 'xdebug.max_nesting_level should be above 100 in php.ini',
 536                 'Set "<strong>xdebug.max_nesting_level</strong>" to e.g. "<strong>250</strong>" in php.ini<a href="#phpini">*</a> to stop Xdebug\'s infinite recursion protection erroneously throwing a fatal error in your project.'
 537             );
 538         }
 539
 540         $pcreVersion = defined('PCRE_VERSION') ? (float) PCRE_VERSION : null;
 541
 542         $this->addRequirement(
 543             null !== $pcreVersion,
 544             'PCRE extension must be available',
 545             'Install the <strong>PCRE</strong> extension (version 8.0+).'
 546         );
 547
 548         if (extension_loaded('mbstring')) {
 549             $this->addPhpIniRequirement(
 550                 'mbstring.func_overload',
 551                 create_function('$cfgValue', 'return (int) $cfgValue === 0;'),
 552                 true,
 553                 'string functions should not be overloaded',
 554                 'Set "<strong>mbstring.func_overload</strong>" to <strong>0</strong> in php.ini<a href="#phpini">*</a> to disable function overloading by the mbstring extension.'
 555             );
 556         }
 557
 558         /* optional recommendations follow */
 559
 560         if (file_exists(__DIR__.'/../vendor/composer')) {
 561             require_once __DIR__.'/../vendor/autoload.php';
 562
 563             try {
 564                 $r = new ReflectionClass('Sensio\Bundle\DistributionBundle\SensioDistributionBundle');
 565
 566                 $contents = file_get_contents(dirname($r->getFileName()).'/Resources/skeleton/app/SymfonyRequirements.php');
 567             } catch (ReflectionException $e) {
 568                 $contents = '';
 569             }
 570             $this->addRecommendation(
 571                 file_get_contents(__FILE__) === $contents,
 572                 'Requirements file should be up-to-date',
 573                 'Your requirements file is outdated. Run composer install and re-check your configuration.'
 574             );
 575         }
 576
 577         $this->addRecommendation(
 578             version_compare($installedPhpVersion, '5.3.4', '>='),
 579             'You should use at least PHP 5.3.4 due to PHP bug #52083 in earlier versions',
 580             'Your project might malfunction randomly due to PHP bug #52083 ("Notice: Trying to get property of non-object"). Install PHP 5.3.4 or newer.'
 581         );
 582
 583         $this->addRecommendation(
 584             version_compare($installedPhpVersion, '5.3.8', '>='),
 585             'When using annotations you should have at least PHP 5.3.8 due to PHP bug #55156',
 586             'Install PHP 5.3.8 or newer if your project uses annotations.'
 587         );
 588
 589         $this->addRecommendation(
 590             version_compare($installedPhpVersion, '5.4.0', '!='),
 591             'You should not use PHP 5.4.0 due to the PHP bug #61453',
 592             'Your project might not work properly due to the PHP bug #61453 ("Cannot dump definitions which have method calls"). Install PHP 5.4.1 or newer.'
 593         );
 594
 595         $this->addRecommendation(
 596             version_compare($installedPhpVersion, '5.4.11', '>='),
 597             'When using the logout handler from the Symfony Security Component, you should have at least PHP 5.4.11 due to PHP bug #63379 (as a workaround, you can also set invalidate_session to false in the security logout handler configuration)',
 598             'Install PHP 5.4.11 or newer if your project uses the logout handler from the Symfony Security Component.'
 599         );
 600
 601         $this->addRecommendation(
 602             (version_compare($installedPhpVersion, '5.3.18', '>=') && version_compare($installedPhpVersion, '5.4.0', '<'))
 603             ||
 604             version_compare($installedPhpVersion, '5.4.8', '>='),
 605             'You should use PHP 5.3.18+ or PHP 5.4.8+ to always get nice error messages for fatal errors in the development environment due to PHP bug #61767/#60909',
 606             'Install PHP 5.3.18+ or PHP 5.4.8+ if you want nice error messages for all fatal errors in the development environment.'
 607         );
 608
 609         if (null !== $pcreVersion) {
 610             $this->addRecommendation(
 611                 $pcreVersion >= 8.0,
 612                 sprintf('PCRE extension should be at least version 8.0 (%s installed)', $pcreVersion),
 613                 '<strong>PCRE 8.0+</strong> is preconfigured in PHP since 5.3.2 but you are using an outdated version of it. Symfony probably works anyway but it is recommended to upgrade your PCRE extension.'
 614             );
 615         }
 616
 617         $this->addRecommendation(
 618             class_exists('DomDocument'),
 619             'PHP-DOM and PHP-XML modules should be installed',
 620             'Install and enable the <strong>PHP-DOM</strong> and the <strong>PHP-XML</strong> modules.'
 621         );
 622
 623         $this->addRecommendation(
 624             function_exists('mb_strlen'),
 625             'mb_strlen() should be available',
 626             'Install and enable the <strong>mbstring</strong> extension.'
 627         );
 628
 629         $this->addRecommendation(
 630             function_exists('utf8_decode'),
 631             'utf8_decode() should be available',
 632             'Install and enable the <strong>XML</strong> extension.'
 633         );
 634
 635         $this->addRecommendation(
 636             function_exists('filter_var'),
 637             'filter_var() should be available',
 638             'Install and enable the <strong>filter</strong> extension.'
 639         );
 640
 641         if (!defined('PHP_WINDOWS_VERSION_BUILD')) {
 642             $this->addRecommendation(
 643                 function_exists('posix_isatty'),
 644                 'posix_isatty() should be available',
 645                 'Install and enable the <strong>php_posix</strong> extension (used to colorize the CLI output).'
 646             );
 647         }
 648
 649         $this->addRecommendation(
 650             extension_loaded('intl'),
 651             'intl extension should be available',
 652             'Install and enable the <strong>intl</strong> extension (used for validators).'
 653         );
 654
 655         if (extension_loaded('intl')) {
 656             // in some WAMP server installations, new Collator() returns null
 657             $this->addRecommendation(
 658                 null !== new Collator('fr_FR'),
 659                 'intl extension should be correctly configured',
 660                 'The intl extension does not behave properly. This problem is typical on PHP 5.3.X x64 WIN builds.'
 661             );
 662
 663             // check for compatible ICU versions (only done when you have the intl extension)
 664             if (defined('INTL_ICU_VERSION')) {
 665                 $version = INTL_ICU_VERSION;
 666             } else {
 667                 $reflector = new ReflectionExtension('intl');
 668
 669                 ob_start();
 670                 $reflector->info();
 671                 $output = strip_tags(ob_get_clean());
 672
 673                 preg_match('/^ICU version +(?:=> )?(.*)$/m', $output, $matches);
 674                 $version = $matches[1];
 675             }
 676
 677             $this->addRecommendation(
 678                 version_compare($version, '4.0', '>='),
 679                 'intl ICU version should be at least 4+',
 680                 'Upgrade your <strong>intl</strong> extension with a newer ICU version (4+).'
 681             );
 682
 683             if (class_exists('Symfony\Component\Intl\Intl')) {
 684                 $this->addRecommendation(
 685                     \Symfony\Component\Intl\Intl::getIcuDataVersion() <= \Symfony\Component\Intl\Intl::getIcuVersion(),
 686                     sprintf('intl ICU version installed on your system is outdated (%s) and does not match the ICU data bundled with Symfony (%s)', \Symfony\Component\Intl\Intl::getIcuVersion(), \Symfony\Component\Intl\Intl::getIcuDataVersion()),
 687                     'To get the latest internationalization data upgrade the ICU system package and the intl PHP extension.'
 688                 );
 689                 if (\Symfony\Component\Intl\Intl::getIcuDataVersion() <= \Symfony\Component\Intl\Intl::getIcuVersion()) {
 690                     $this->addRecommendation(
 691                         \Symfony\Component\Intl\Intl::getIcuDataVersion() === \Symfony\Component\Intl\Intl::getIcuVersion(),
 692                         sprintf('intl ICU version installed on your system (%s) does not match the ICU data bundled with Symfony (%s)', \Symfony\Component\Intl\Intl::getIcuVersion(), \Symfony\Component\Intl\Intl::getIcuDataVersion()),
 693                         'To avoid internationalization data inconsistencies upgrade the symfony/intl component.'
 694                     );
 695                 }
 696             }
 697
 698             $this->addPhpIniRecommendation(
 699                 'intl.error_level',
 700                 create_function('$cfgValue', 'return (int) $cfgValue === 0;'),
 701                 true,
 702                 'intl.error_level should be 0 in php.ini',
 703                 'Set "<strong>intl.error_level</strong>" to "<strong>0</strong>" in php.ini<a href="#phpini">*</a> to inhibit the messages when an error occurs in ICU functions.'
 704             );
 705         }
 706
 707         $accelerator =
 708             (extension_loaded('eaccelerator') && ini_get('eaccelerator.enable'))
 709             ||
 710             (extension_loaded('apc') && ini_get('apc.enabled'))
 711             ||
 712             (extension_loaded('Zend Optimizer+') && ini_get('zend_optimizerplus.enable'))
 713             ||
 714             (extension_loaded('Zend OPcache') && ini_get('opcache.enable'))
 715             ||
 716             (extension_loaded('xcache') && ini_get('xcache.cacher'))
 717             ||
 718             (extension_loaded('wincache') && ini_get('wincache.ocenabled'))
 719         ;
 720
 721         $this->addRecommendation(
 722             $accelerator,
 723             'a PHP accelerator should be installed',
 724             'Install and/or enable a <strong>PHP accelerator</strong> (highly recommended).'
 725         );
 726
 727         if ('WIN' === strtoupper(substr(PHP_OS, 0, 3))) {
 728             $this->addRecommendation(
 729                 $this->getRealpathCacheSize() >= 5 * 1024 * 1024,
 730                 'realpath_cache_size should be at least 5M in php.ini',
 731                 'Setting "<strong>realpath_cache_size</strong>" to e.g. "<strong>5242880</strong>" or "<strong>5M</strong>" in php.ini<a href="#phpini">*</a> may improve performance on Windows significantly in some cases.'
 732             );
 733         }
 734
 735         $this->addPhpIniRecommendation('short_open_tag', false);
 736
 737         $this->addPhpIniRecommendation('magic_quotes_gpc', false, true);
 738
 739         $this->addPhpIniRecommendation('register_globals', false, true);
 740
 741         $this->addPhpIniRecommendation('session.auto_start', false);
 742
 743         $this->addRecommendation(
 744             class_exists('PDO'),
 745             'PDO should be installed',
 746             'Install <strong>PDO</strong> (mandatory for Doctrine).'
 747         );
 748
 749         if (class_exists('PDO')) {
 750             $drivers = PDO::getAvailableDrivers();
 751             $this->addRecommendation(
 752                 count($drivers) > 0,
 753                 sprintf('PDO should have some drivers installed (currently available: %s)', count($drivers) ? implode(', ', $drivers) : 'none'),
 754                 'Install <strong>PDO drivers</strong> (mandatory for Doctrine).'
 755             );
 756         }
 757     }
 758
 759     /**
 760      * Loads realpath_cache_size from php.ini and converts it to int.
 761      *
 762      * (e.g. 16k is converted to 16384 int)
 763      *
 764      * @return int
 765      */
 766     protected function getRealpathCacheSize()
 767     {
 768         $size = ini_get('realpath_cache_size');
 769         $size = trim($size);
 770         $unit = '';
 771         if (!ctype_digit($size)) {
 772             $unit = strtolower(substr($size, -1, 1));
 773             $size = (int) substr($size, 0, -1);
 774         }
 775         switch ($unit) {
 776             case 'g':
 777                 return $size * 1024 * 1024 * 1024;
 778             case 'm':
 779                 return $size * 1024 * 1024;
 780             case 'k':
 781                 return $size * 1024;
 782             default:
 783                 return (int) $size;
 784         }
 785     }
 786
 787     /**
 788      * Defines PHP required version from Symfony version.
 789      *
 790      * @return string|false The PHP required version or false if it could not be guessed
 791      */
 792     protected function getPhpRequiredVersion()
 793     {
 794         if (!file_exists($path = __DIR__.'/../composer.lock')) {
 795             return false;
 796         }
 797
 798         $composerLock = json_decode(file_get_contents($path), true);
 799         foreach ($composerLock['packages'] as $package) {
 800             $name = $package['name'];
 801             if ('symfony/symfony' !== $name && 'symfony/http-kernel' !== $name) {
 802                 continue;
 803             }
 804
 805             return (int) $package['version'][1] > 2 ? self::REQUIRED_PHP_VERSION : self::LEGACY_REQUIRED_PHP_VERSION;
 806         }
 807
 808         return false;
 809     }
 810 }