3v4l.org

run code in 300+ PHP versions simultaneously
<?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) . PHP_EOL; echo 'COLLISION: ' . $result . PHP_EOL; } else { $gens[] = $result; } }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.24, 7.0.26 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
Output for 7.0.25
Count: 933 COLLISION: 691473865

preferences:
168.33 ms | 401 KiB | 195 Q