<?php function uuid($c = 4) { $x4 = function($c) { for ($n = ''; strlen($n) < $c + 1; $n = $n.mt_rand()); return substr($n, -$c); }; return sprintf( '%s-%04d-%04d-%04d-%04d%04d%04d', time(), $x($c), $x($c), $x($c), $x($c), $x($c), $x($c), $x($c) ); } echo uuid();
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