3v4l.org

run code in 200+ PHP versions simultaneously
<?php /** * @param string $T the string to re-order * @param string $O the string that specifies the desired order * @return string the re-ordered $T */ function reorder($T, $O) { // Convert $T and $O to arrays of characters $t = str_split($T); $o = str_split($O); // Compute the index of each character from $T in $O // Use -1 for characters that do not appear in $O $m = array_map(function($x) use ($o) { $p = array_search($x, $o); return ($p === FALSE) ? -1 : $p; }, $t ); // Sort $m and $t simultaneously; $t will follow the changes applied to $m array_multisort($m, $t); // Join the sorted characters of $T back and return as string return implode('', $t); } $order = 'eloh'; echo('hello => '.reorder('hello', $order)."\n"); echo('help => '.reorder('help', $order)."\n");
Output for 5.3.0 - 7.4.0
hello => elloh help => pelh
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/qqiO5 on line 15
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/qqiO5 on line 15
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/qqiO5 on line 15
Process exited with code 255.