3v4l.org

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<?php $gens = []; for ($i = 0; $i < 1000; $i++) { $entropy=1; if (function_exists("posix_getpid")) $entropy *= posix_getpid(); if (function_exists("memory_get_usage")) $entropy *= memory_get_usage(); list($usec, $sec) = explode(" ", microtime()); $usec *= 1000000; $entropy *= $usec; mt_srand($entropy); $result = mt_rand(); if (in_array($result, $gens)) { echo 'Count: ' . count($gens); echo 'COLLISION: ' . $result; } else { $gens[] = $result; } }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.24, 7.3.0 - 7.3.12

preferences:
100.62 ms | 402 KiB | 91 Q