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, STR_PAD_LEFT)); echo "$a | $b | " . $a|$b; echo "\n"; }

preferences:
49.7 ms | 402 KiB | 5 Q