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run code in 300+ PHP versions simultaneously
<?php function multiID($n=32) { for ($x=$s=0,$r=null; $x<$n; $x++) { $c = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890'; if (($x<$n) && ($x > 0) && ($s < 2)) { $c .= "\002D_"; } $g = substr($c, mt_rand(0, strlen($c) - 1), 1); $r .= $g; if (($g == '_') || ($g == "\002D")) { $s++; } } return $r; } echo multiID(6);

preferences:
33.32 ms | 402 KiB | 5 Q