3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = array(NAN, 0, 0.0, "0", "0.0", "-0"); foreach($s as $y){foreach($s as $x){printf("%2d", $x <=> $y);}echo "\n";}

preferences:
51.73 ms | 402 KiB | 5 Q