]>
Commit | Line | Data |
---|---|---|
ca74886f V |
1 | <?php |
2 | /** | |
3 | * Shaarli utilities | |
4 | */ | |
5 | ||
6 | /** | |
7 | * Returns the small hash of a string, using RFC 4648 base64url format | |
8 | * | |
9 | * Small hashes: | |
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) | |
14 | * | |
15 | * In Shaarli, they are used as a tinyurl-like link to individual entries, | |
16 | * e.g. smallHash('20111006_131924') --> yZH23w | |
17 | */ | |
18 | function smallHash($text) | |
19 | { | |
20 | $t = rtrim(base64_encode(hash('crc32', $text, true)), '='); | |
21 | return strtr($t, '+/', '-_'); | |
22 | } | |
23 | ||
24 | /** | |
25 | * Tells if a string start with a substring | |
26 | */ | |
27 | function startsWith($haystack, $needle, $case=true) | |
28 | { | |
29 | if ($case) { | |
30 | return (strcmp(substr($haystack, 0, strlen($needle)), $needle) === 0); | |
31 | } | |
32 | return (strcasecmp(substr($haystack, 0, strlen($needle)), $needle) === 0); | |
33 | } | |
34 | ||
35 | /** | |
36 | * Tells if a string ends with a substring | |
37 | */ | |
38 | function endsWith($haystack, $needle, $case=true) | |
39 | { | |
40 | if ($case) { | |
41 | return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0); | |
42 | } | |
43 | return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0); | |
44 | } | |
64bc92e3 | 45 | |
46 | /** | |
47 | * Same as nl2br(), but escapes < and > | |
48 | */ | |
49 | function nl2br_escaped($html) | |
50 | { | |
51 | return str_replace('>','>',str_replace('<','<',nl2br($html))); | |
52 | } | |
53 | ||
54 | /** | |
55 | * htmlspecialchars wrapper | |
56 | */ | |
57 | function escape($str) | |
58 | { | |
59 | return htmlspecialchars($str, ENT_COMPAT, 'UTF-8', false); | |
60 | } | |
61 | ||
62 | /** | |
63 | * Link sanitization before templating | |
64 | */ | |
65 | function sanitizeLink(&$link) | |
66 | { | |
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']); | |
71 | } | |
9186ab95 V |
72 | |
73 | /** | |
74 | * Checks if a string represents a valid date | |
75 | * | |
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 | |
81 | */ | |
82 | function checkDateFormat($format, $string) | |
83 | { | |
84 | $date = DateTime::createFromFormat($format, $string); | |
85 | return $date && $date->format($string) == $string; | |
86 | } | |
ca74886f | 87 | ?> |