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     private $requirements = array();
 172
 173     /**
 174      * Gets the current RequirementCollection as an Iterator.
 175      *
 176      * @return Traversable A Traversable interface
 177      */
 178     public function getIterator()
 179     {
 180         return new ArrayIterator($this->requirements);
 181     }
 182
 183     /**
 184      * Adds a Requirement.
 185      *
 186      * @param Requirement $requirement A Requirement instance
 187      */
 188     public function add(Requirement $requirement)
 189     {
 190         $this->requirements[] = $requirement;
 191     }
 192
 193     /**
 194      * Adds a mandatory requirement.
 195      *
 196      * @param bool        $fulfilled   Whether the requirement is fulfilled
 197      * @param string      $testMessage The message for testing the requirement
 198      * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
 199      * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 200      */
 201     public function addRequirement($fulfilled, $testMessage, $helpHtml, $helpText = null)
 202     {
 203         $this->add(new Requirement($fulfilled, $testMessage, $helpHtml, $helpText, false));
 204     }
 205
 206     /**
 207      * Adds an optional recommendation.
 208      *
 209      * @param bool        $fulfilled   Whether the recommendation is fulfilled
 210      * @param string      $testMessage The message for testing the recommendation
 211      * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
 212      * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 213      */
 214     public function addRecommendation($fulfilled, $testMessage, $helpHtml, $helpText = null)
 215     {
 216         $this->add(new Requirement($fulfilled, $testMessage, $helpHtml, $helpText, true));
 217     }
 218
 219     /**
 220      * Adds a mandatory requirement in form of a php.ini configuration.
 221      *
 222      * @param string        $cfgName           The configuration name used for ini_get()
 223      * @param bool|callback $evaluation        Either a boolean indicating whether the configuration should evaluate to true or false,
 224      *                                         or a callback function receiving the configuration value as parameter to determine the fulfillment of the requirement
 225      * @param bool          $approveCfgAbsence If true the Requirement will be fulfilled even if the configuration option does not exist, i.e. ini_get() returns false.
 226      *                                         This is helpful for abandoned configs in later PHP versions or configs of an optional extension, like Suhosin.
 227      *                                         Example: You require a config to be true but PHP later removes this config and defaults it to true internally.
 228      * @param string        $testMessage       The message for testing the requirement (when null and $evaluation is a boolean a default message is derived)
 229      * @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)
 230      * @param string|null   $helpText          The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 231      */
 232     public function addPhpIniRequirement($cfgName, $evaluation, $approveCfgAbsence = false, $testMessage = null, $helpHtml = null, $helpText = null)
 233     {
 234         $this->add(new PhpIniRequirement($cfgName, $evaluation, $approveCfgAbsence, $testMessage, $helpHtml, $helpText, false));
 235     }
 236
 237     /**
 238      * Adds an optional recommendation in form of a php.ini configuration.
 239      *
 240      * @param string        $cfgName           The configuration name used for ini_get()
 241      * @param bool|callback $evaluation        Either a boolean indicating whether the configuration should evaluate to true or false,
 242      *                                         or a callback function receiving the configuration value as parameter to determine the fulfillment of the requirement
 243      * @param bool          $approveCfgAbsence If true the Requirement will be fulfilled even if the configuration option does not exist, i.e. ini_get() returns false.
 244      *                                         This is helpful for abandoned configs in later PHP versions or configs of an optional extension, like Suhosin.
 245      *                                         Example: You require a config to be true but PHP later removes this config and defaults it to true internally.
 246      * @param string        $testMessage       The message for testing the requirement (when null and $evaluation is a boolean a default message is derived)
 247      * @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)
 248      * @param string|null   $helpText          The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
 249      */
 250     public function addPhpIniRecommendation($cfgName, $evaluation, $approveCfgAbsence = false, $testMessage = null, $helpHtml = null, $helpText = null)
 251     {
 252         $this->add(new PhpIniRequirement($cfgName, $evaluation, $approveCfgAbsence, $testMessage, $helpHtml, $helpText, true));
 253     }
 254
 255     /**
 256      * Adds a requirement collection to the current set of requirements.
 257      *
 258      * @param RequirementCollection $collection A RequirementCollection instance
 259      */
 260     public function addCollection(RequirementCollection $collection)
 261     {
 262         $this->requirements = array_merge($this->requirements, $collection->all());
 263     }
 264
 265     /**
 266      * Returns both requirements and recommendations.
 267      *
 268      * @return array Array of Requirement instances
 269      */
 270     public function all()
 271     {
 272         return $this->requirements;
 273     }
 274
 275     /**
 276      * Returns all mandatory requirements.
 277      *
 278      * @return array Array of Requirement instances
 279      */
 280     public function getRequirements()
 281     {
 282         $array = array();
 283         foreach ($this->requirements as $req) {
 284             if (!$req->isOptional()) {
 285                 $array[] = $req;
 286             }
 287         }
 288
 289         return $array;
 290     }
 291
 292     /**
 293      * Returns the mandatory requirements that were not met.
 294      *
 295      * @return array Array of Requirement instances
 296      */
 297     public function getFailedRequirements()
 298     {
 299         $array = array();
 300         foreach ($this->requirements as $req) {
 301             if (!$req->isFulfilled() && !$req->isOptional()) {
 302                 $array[] = $req;
 303             }
 304         }
 305
 306         return $array;
 307     }
 308
 309     /**
 310      * Returns all optional recommendations.
 311      *
 312      * @return array Array of Requirement instances
 313      */
 314     public function getRecommendations()
 315     {
 316         $array = array();
 317         foreach ($this->requirements as $req) {
 318             if ($req->isOptional()) {
 319                 $array[] = $req;
 320             }
 321         }
 322
 323         return $array;
 324     }
 325
 326     /**
 327      * Returns the recommendations that were not met.
 328      *
 329      * @return array Array of Requirement instances
 330      */
 331     public function getFailedRecommendations()
 332     {
 333         $array = array();
 334         foreach ($this->requirements as $req) {
 335             if (!$req->isFulfilled() && $req->isOptional()) {
 336                 $array[] = $req;
 337             }
 338         }
 339
 340         return $array;
 341     }
 342
 343     /**
 344      * Returns whether a php.ini configuration is not correct.
 345      *
 346      * @return bool php.ini configuration problem?
 347      */
 348     public function hasPhpIniConfigIssue()
 349     {
 350         foreach ($this->requirements as $req) {
 351             if (!$req->isFulfilled() && $req instanceof PhpIniRequirement) {
 352                 return true;
 353             }
 354         }
 355
 356         return false;
 357     }
 358
 359     /**
 360      * Returns the PHP configuration file (php.ini) path.
 361      *
 362      * @return string|false php.ini file path
 363      */
 364     public function getPhpIniConfigPath()
 365     {
 366         return get_cfg_var('cfg_file_path');
 367     }
 368 }
 369
 370 /**
 371  * This class specifies all requirements and optional recommendations that
 372  * are necessary to run the Symfony Standard Edition.
 373  *
 374  * @author Tobias Schultze <http://tobion.de>
 375  * @author Fabien Potencier <fabien@symfony.com>
 376  */
 377 class SymfonyRequirements extends RequirementCollection
 378 {
 379     const REQUIRED_PHP_VERSION = '5.3.3';
 380
 381     /**
 382      * Constructor that initializes the requirements.
 383      */
 384     public function __construct()
 385     {
 386         /* mandatory requirements follow */
 387
 388         $installedPhpVersion = phpversion();
 389
 390         $this->addRequirement(
 391             version_compare($installedPhpVersion, self::REQUIRED_PHP_VERSION, '>='),
 392             sprintf('PHP version must be at least %s (%s installed)', self::REQUIRED_PHP_VERSION, $installedPhpVersion),
 393             sprintf('You are running PHP version "<strong>%s</strong>", but Symfony needs at least PHP "<strong>%s</strong>" to run.
 394                 Before using Symfony, upgrade your PHP installation, preferably to the latest version.',
 395                 $installedPhpVersion, self::REQUIRED_PHP_VERSION),
 396             sprintf('Install PHP %s or newer (installed version is %s)', self::REQUIRED_PHP_VERSION, $installedPhpVersion)
 397         );
 398
 399         $this->addRequirement(
 400             version_compare($installedPhpVersion, '5.3.16', '!='),
 401             'PHP version must not be 5.3.16 as Symfony won\'t work properly with it',
 402             'Install PHP 5.3.17 or newer (or downgrade to an earlier PHP version)'
 403         );
 404
 405         $this->addRequirement(
 406             is_dir(__DIR__.'/../vendor/composer'),
 407             'Vendor libraries must be installed',
 408             'Vendor libraries are missing. Install composer following instructions from <a href="http://getcomposer.org/">http://getcomposer.org/</a>. '.
 409                 'Then run "<strong>php composer.phar install</strong>" to install them.'
 410         );
 411
 412         $cacheDir = is_dir(__DIR__.'/../var/cache') ? __DIR__.'/../var/cache' : __DIR__.'/cache';
 413
 414         $this->addRequirement(
 415             is_writable($cacheDir),
 416             'app/cache/ or var/cache/ directory must be writable',
 417             'Change the permissions of either "<strong>app/cache/</strong>" or  "<strong>var/cache/</strong>" directory so that the web server can write into it.'
 418         );
 419
 420         $logsDir = is_dir(__DIR__.'/../var/logs') ? __DIR__.'/../var/logs' : __DIR__.'/logs';
 421
 422         $this->addRequirement(
 423             is_writable($logsDir),
 424             'app/logs/ or var/logs/ directory must be writable',
 425             'Change the permissions of either "<strong>app/logs/</strong>" or  "<strong>var/logs/</strong>" directory so that the web server can write into it.'
 426         );
 427
 428         $this->addPhpIniRequirement(
 429             'date.timezone', true, false,
 430             'date.timezone setting must be set',
 431             'Set the "<strong>date.timezone</strong>" setting in php.ini<a href="#phpini">*</a> (like Europe/Paris).'
 432         );
 433
 434         if (version_compare($installedPhpVersion, self::REQUIRED_PHP_VERSION, '>=')) {
 435             $timezones = array();
 436             foreach (DateTimeZone::listAbbreviations() as $abbreviations) {
 437                 foreach ($abbreviations as $abbreviation) {
 438                     $timezones[$abbreviation['timezone_id']] = true;
 439                 }
 440             }
 441
 442             $this->addRequirement(
 443                 isset($timezones[@date_default_timezone_get()]),
 444                 sprintf('Configured default timezone "%s" must be supported by your installation of PHP', @date_default_timezone_get()),
 445                 '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>.'
 446             );
 447         }
 448
 449         $this->addRequirement(
 450             function_exists('iconv'),
 451             'iconv() must be available',
 452             'Install and enable the <strong>iconv</strong> extension.'
 453         );
 454
 455         $this->addRequirement(
 456             function_exists('json_encode'),
 457             'json_encode() must be available',
 458             'Install and enable the <strong>JSON</strong> extension.'
 459         );
 460
 461         $this->addRequirement(
 462             function_exists('session_start'),
 463             'session_start() must be available',
 464             'Install and enable the <strong>session</strong> extension.'
 465         );
 466
 467         $this->addRequirement(
 468             function_exists('ctype_alpha'),
 469             'ctype_alpha() must be available',
 470             'Install and enable the <strong>ctype</strong> extension.'
 471         );
 472
 473         $this->addRequirement(
 474             function_exists('token_get_all'),
 475             'token_get_all() must be available',
 476             'Install and enable the <strong>Tokenizer</strong> extension.'
 477         );
 478
 479         $this->addRequirement(
 480             function_exists('simplexml_import_dom'),
 481             'simplexml_import_dom() must be available',
 482             'Install and enable the <strong>SimpleXML</strong> extension.'
 483         );
 484
 485         if (function_exists('apc_store') && ini_get('apc.enabled')) {
 486             if (version_compare($installedPhpVersion, '5.4.0', '>=')) {
 487                 $this->addRequirement(
 488                     version_compare(phpversion('apc'), '3.1.13', '>='),
 489                     'APC version must be at least 3.1.13 when using PHP 5.4',
 490                     'Upgrade your <strong>APC</strong> extension (3.1.13+).'
 491                 );
 492             } else {
 493                 $this->addRequirement(
 494                     version_compare(phpversion('apc'), '3.0.17', '>='),
 495                     'APC version must be at least 3.0.17',
 496                     'Upgrade your <strong>APC</strong> extension (3.0.17+).'
 497                 );
 498             }
 499         }
 500
 501         $this->addPhpIniRequirement('detect_unicode', false);
 502
 503         if (extension_loaded('suhosin')) {
 504             $this->addPhpIniRequirement(
 505                 'suhosin.executor.include.whitelist',
 506                 create_function('$cfgValue', 'return false !== stripos($cfgValue, "phar");'),
 507                 false,
 508                 'suhosin.executor.include.whitelist must be configured correctly in php.ini',
 509                 'Add "<strong>phar</strong>" to <strong>suhosin.executor.include.whitelist</strong> in php.ini<a href="#phpini">*</a>.'
 510             );
 511         }
 512
 513         if (extension_loaded('xdebug')) {
 514             $this->addPhpIniRequirement(
 515                 'xdebug.show_exception_trace', false, true
 516             );
 517
 518             $this->addPhpIniRequirement(
 519                 'xdebug.scream', false, true
 520             );
 521
 522             $this->addPhpIniRecommendation(
 523                 'xdebug.max_nesting_level',
 524                 create_function('$cfgValue', 'return $cfgValue > 100;'),
 525                 true,
 526                 'xdebug.max_nesting_level should be above 100 in php.ini',
 527                 '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.'
 528             );
 529         }
 530
 531         $pcreVersion = defined('PCRE_VERSION') ? (float) PCRE_VERSION : null;
 532
 533         $this->addRequirement(
 534             null !== $pcreVersion,
 535             'PCRE extension must be available',
 536             'Install the <strong>PCRE</strong> extension (version 8.0+).'
 537         );
 538
 539         if (extension_loaded('mbstring')) {
 540             $this->addPhpIniRequirement(
 541                 'mbstring.func_overload',
 542                 create_function('$cfgValue', 'return (int) $cfgValue === 0;'),
 543                 true,
 544                 'string functions should not be overloaded',
 545                 '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.'
 546             );
 547         }
 548
 549         /* optional recommendations follow */
 550
 551         if (file_exists(__DIR__.'/../vendor/composer')) {
 552             require_once __DIR__.'/../vendor/autoload.php';
 553
 554             try {
 555                 $r = new ReflectionClass('Sensio\Bundle\DistributionBundle\SensioDistributionBundle');
 556
 557                 $contents = file_get_contents(dirname($r->getFileName()).'/Resources/skeleton/app/SymfonyRequirements.php');
 558             } catch (ReflectionException $e) {
 559                 $contents = '';
 560             }
 561             $this->addRecommendation(
 562                 file_get_contents(__FILE__) === $contents,
 563                 'Requirements file should be up-to-date',
 564                 'Your requirements file is outdated. Run composer install and re-check your configuration.'
 565             );
 566         }
 567
 568         $this->addRecommendation(
 569             version_compare($installedPhpVersion, '5.3.4', '>='),
 570             'You should use at least PHP 5.3.4 due to PHP bug #52083 in earlier versions',
 571             '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.'
 572         );
 573
 574         $this->addRecommendation(
 575             version_compare($installedPhpVersion, '5.3.8', '>='),
 576             'When using annotations you should have at least PHP 5.3.8 due to PHP bug #55156',
 577             'Install PHP 5.3.8 or newer if your project uses annotations.'
 578         );
 579
 580         $this->addRecommendation(
 581             version_compare($installedPhpVersion, '5.4.0', '!='),
 582             'You should not use PHP 5.4.0 due to the PHP bug #61453',
 583             '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.'
 584         );
 585
 586         $this->addRecommendation(
 587             version_compare($installedPhpVersion, '5.4.11', '>='),
 588             '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)',
 589             'Install PHP 5.4.11 or newer if your project uses the logout handler from the Symfony Security Component.'
 590         );
 591
 592         $this->addRecommendation(
 593             (version_compare($installedPhpVersion, '5.3.18', '>=') && version_compare($installedPhpVersion, '5.4.0', '<'))
 594             ||
 595             version_compare($installedPhpVersion, '5.4.8', '>='),
 596             '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',
 597             'Install PHP 5.3.18+ or PHP 5.4.8+ if you want nice error messages for all fatal errors in the development environment.'
 598         );
 599
 600         if (null !== $pcreVersion) {
 601             $this->addRecommendation(
 602                 $pcreVersion >= 8.0,
 603                 sprintf('PCRE extension should be at least version 8.0 (%s installed)', $pcreVersion),
 604                 '<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.'
 605             );
 606         }
 607
 608         $this->addRecommendation(
 609             class_exists('DomDocument'),
 610             'PHP-DOM and PHP-XML modules should be installed',
 611             'Install and enable the <strong>PHP-DOM</strong> and the <strong>PHP-XML</strong> modules.'
 612         );
 613
 614         $this->addRecommendation(
 615             function_exists('mb_strlen'),
 616             'mb_strlen() should be available',
 617             'Install and enable the <strong>mbstring</strong> extension.'
 618         );
 619
 620         $this->addRecommendation(
 621             function_exists('iconv'),
 622             'iconv() should be available',
 623             'Install and enable the <strong>iconv</strong> extension.'
 624         );
 625
 626         $this->addRecommendation(
 627             function_exists('utf8_decode'),
 628             'utf8_decode() should be available',
 629             'Install and enable the <strong>XML</strong> extension.'
 630         );
 631
 632         $this->addRecommendation(
 633             function_exists('filter_var'),
 634             'filter_var() should be available',
 635             'Install and enable the <strong>filter</strong> extension.'
 636         );
 637
 638         if (!defined('PHP_WINDOWS_VERSION_BUILD')) {
 639             $this->addRecommendation(
 640                 function_exists('posix_isatty'),
 641                 'posix_isatty() should be available',
 642                 'Install and enable the <strong>php_posix</strong> extension (used to colorize the CLI output).'
 643             );
 644         }
 645
 646         $this->addRecommendation(
 647             extension_loaded('intl'),
 648             'intl extension should be available',
 649             'Install and enable the <strong>intl</strong> extension (used for validators).'
 650         );
 651
 652         if (extension_loaded('intl')) {
 653             // in some WAMP server installations, new Collator() returns null
 654             $this->addRecommendation(
 655                 null !== new Collator('fr_FR'),
 656                 'intl extension should be correctly configured',
 657                 'The intl extension does not behave properly. This problem is typical on PHP 5.3.X x64 WIN builds.'
 658             );
 659
 660             // check for compatible ICU versions (only done when you have the intl extension)
 661             if (defined('INTL_ICU_VERSION')) {
 662                 $version = INTL_ICU_VERSION;
 663             } else {
 664                 $reflector = new ReflectionExtension('intl');
 665
 666                 ob_start();
 667                 $reflector->info();
 668                 $output = strip_tags(ob_get_clean());
 669
 670                 preg_match('/^ICU version +(?:=> )?(.*)$/m', $output, $matches);
 671                 $version = $matches[1];
 672             }
 673
 674             $this->addRecommendation(
 675                 version_compare($version, '4.0', '>='),
 676                 'intl ICU version should be at least 4+',
 677                 'Upgrade your <strong>intl</strong> extension with a newer ICU version (4+).'
 678             );
 679
 680             $this->addPhpIniRecommendation(
 681                 'intl.error_level',
 682                 create_function('$cfgValue', 'return (int) $cfgValue === 0;'),
 683                 true,
 684                 'intl.error_level should be 0 in php.ini',
 685                 '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.'
 686             );
 687         }
 688
 689         $accelerator =
 690             (extension_loaded('eaccelerator') && ini_get('eaccelerator.enable'))
 691             ||
 692             (extension_loaded('apc') && ini_get('apc.enabled'))
 693             ||
 694             (extension_loaded('Zend Optimizer+') && ini_get('zend_optimizerplus.enable'))
 695             ||
 696             (extension_loaded('Zend OPcache') && ini_get('opcache.enable'))
 697             ||
 698             (extension_loaded('xcache') && ini_get('xcache.cacher'))
 699             ||
 700             (extension_loaded('wincache') && ini_get('wincache.ocenabled'))
 701         ;
 702
 703         $this->addRecommendation(
 704             $accelerator,
 705             'a PHP accelerator should be installed',
 706             'Install and/or enable a <strong>PHP accelerator</strong> (highly recommended).'
 707         );
 708
 709         if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
 710             $this->addRecommendation(
 711                 $this->getRealpathCacheSize() > 1000,
 712                 'realpath_cache_size should be above 1024 in php.ini',
 713                 'Set "<strong>realpath_cache_size</strong>" to e.g. "<strong>1024</strong>" in php.ini<a href="#phpini">*</a> to improve performance on windows.'
 714             );
 715         }
 716
 717         $this->addPhpIniRecommendation('short_open_tag', false);
 718
 719         $this->addPhpIniRecommendation('magic_quotes_gpc', false, true);
 720
 721         $this->addPhpIniRecommendation('register_globals', false, true);
 722
 723         $this->addPhpIniRecommendation('session.auto_start', false);
 724
 725         $this->addRecommendation(
 726             class_exists('PDO'),
 727             'PDO should be installed',
 728             'Install <strong>PDO</strong> (mandatory for Doctrine).'
 729         );
 730
 731         if (class_exists('PDO')) {
 732             $drivers = PDO::getAvailableDrivers();
 733             $this->addRecommendation(
 734                 count($drivers) > 0,
 735                 sprintf('PDO should have some drivers installed (currently available: %s)', count($drivers) ? implode(', ', $drivers) : 'none'),
 736                 'Install <strong>PDO drivers</strong> (mandatory for Doctrine).'
 737             );
 738         }
 739     }
 740
 741     /**
 742      * Loads realpath_cache_size from php.ini and converts it to int.
 743      *
 744      * (e.g. 16k is converted to 16384 int)
 745      *
 746      * @return int
 747      */
 748     protected function getRealpathCacheSize()
 749     {
 750         $size = ini_get('realpath_cache_size');
 751         $size = trim($size);
 752         $unit = strtolower(substr($size, -1, 1));
 753         switch ($unit) {
 754             case 'g':
 755                 return $size * 1024 * 1024 * 1024;
 756             case 'm':
 757                 return $size * 1024 * 1024;
 758             case 'k':
 759                 return $size * 1024;
 760             default:
 761                 return (int) $size;
 762         }
 763     }
 764 }