Online PHP editor | output for vnoC1

@ 2015-03-27T10:07:03Z

<?php
/**
 * Re-order the characters from $T using the order of characters in $O.
 * 
 * @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 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: hello => elloh help => pelh
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 hello => elloh help => pelh
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/vnoC1 on line 17
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/vnoC1 on line 17
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/vnoC1 on line 17
Process exited with code 255.

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