Created
November 16, 2010 07:09
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Generate somewhat strong unique identifiers
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| <?php | |
| /** | |
| * Generate somewhat strong unique identifiers | |
| * Example usage: | |
| * - create non standard mysql ids | |
| * - create app key/secret for OAuth | |
| * - ... | |
| * | |
| * @return string containing the unique identifier | |
| */ | |
| function generateUid() { | |
| $fp = fopen('/dev/urandom','rb'); | |
| $entropy = fread($fp, 32); | |
| fclose($fp); | |
| // in case /dev/urandom is reusing entropy from its pool, let's add a bit more entropy | |
| $entropy .= uniqid(mt_rand(), true); | |
| $hash = sha1($entropy); | |
| // if you're obsessed w/ security use the following instead | |
| // $hash = hash('sha256', $entropy) | |
| return $hash; | |
| } |
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