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git.immae.eu Git - github/shaarli/Shaarli.git/blob - application/Utils.php
7 * Returns the small hash of a string, using RFC 4648 base64url format
10 * - are unique (well, as unique as crc32, at last)
11 * - are always 6 characters long.
12 * - only use the following characters: a-z A-Z 0-9 - _ @
13 * - are NOT cryptographically secure (they CAN be forged)
15 * In Shaarli, they are used as a tinyurl-like link to individual entries,
16 * e.g. smallHash('20111006_131924') --> yZH23w
18 function smallHash($text)
20 $t = rtrim(base64_encode(hash('crc32', $text, true)), '=');
21 return strtr($t, '+/', '-_');
25 * Tells if a string start with a substring
27 function startsWith($haystack, $needle, $case=true)
30 return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
32 return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0);
36 * Tells if a string ends with a substring
38 function endsWith($haystack, $needle, $case=true)
41 return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
43 return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
47 * Same as nl2br(), but escapes < and >
49 function nl2br_escaped($html)
51 return str_replace('>','>',str_replace('<','<',nl2br($html)));
55 * htmlspecialchars wrapper
59 return htmlspecialchars($str, ENT_COMPAT
, 'UTF-8', false);
63 * Link sanitization before templating
65 function sanitizeLink(&$link)
67 $link['url'] = escape($link['url']); // useful?
68 $link['title'] = escape($link['title']);
69 $link['description'] = escape($link['description']);
70 $link['tags'] = escape($link['tags']);
74 * Checks if a string represents a valid date
76 * @param string a string-formatted date
77 * @param format the expected DateTime format of the string
78 * @return whether the string is a valid date
79 * @see http://php.net/manual/en/class.datetime.php
80 * @see http://php.net/manual/en/datetime.createfromformat.php
82 function checkDateFormat($format, $string)
84 $date = DateTime
::createFromFormat($format, $string);
85 return $date && $date->format($string) == $string;