3v4l.org

run code in 300+ PHP versions simultaneously
<?php $nibble1 = hexdec('3'); $nibble2 = hexdec('a'); // nibble1 xnor nibble2 $r = ~($nibble1 ^ $nibble2) & 0x0F; echo dechex($r); // '6'

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40.07 ms | 402 KiB | 5 Q