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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 | } | |
45 | ?> |