3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 60*60*16; $b = '12:31'; echo date("H:i",$a); echo "\n"; echo date("H:i",$b); echo "\n"; echo date("H:i",$a-$b-3600);

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38.04 ms | 402 KiB | 5 Q