3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo "a | b\n"; for($i = 0; $i < 4; $i++){ list($a, $b) = str_split(str_pad(decbin($i), 2, 0)); echo "$a | $b\n"; }

preferences:
49.61 ms | 402 KiB | 5 Q