Online PHP editor | output for OkDhv

@ 2021-04-12T13:06:59Z

<?php

function sorter($array) {
    // find the key which doesn't have a matching value
    $unique = array_diff(array_keys($array), $array);
    $key = reset($unique);
    $value = $array[$key];
    $result = array($key => $value);
    // follow the values backwards until the key matches the value
    while ($key != $value) { 
        $key = $array[$key];
        $value = $array[$key];
        $result = array($key => $value) + $result;
    }
    return $result;
}

$main = array(
    'lorem' => 'lorem',
    'ipsum' => 'duis',
    'sit' => 'adipiscing',
    'duis' => 'sit',
    'amet' => 'elit',
    'consectetur' => 'lorem',
    'adipiscing' => 'consectetur',
    'eiusmod' => 'ipsum',
    'labore' => 'eiusmod',
    'dolore' => 'labore',
    'magna' => 'dolore',
    'aliqua' => 'amet',
    'incididunt' => 'magna',
    'tempor' => 'incididunt',
    'sed' => 'tempor',
    'elit' => 'sed',
);

print_r(sorter($main));

Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.27, 8.4.1 - 8.4.14: Array ( [lorem] => lorem [consectetur] => lorem [adipiscing] => consectetur [sit] => adipiscing [duis] => sit [ipsum] => duis [eiusmod] => ipsum [labore] => eiusmod [dolore] => labore [magna] => dolore [incididunt] => magna [tempor] => incididunt [sed] => tempor [elit] => sed [amet] => elit [aliqua] => amet )
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 Array ( [lorem] => lorem [consectetur] => lorem [adipiscing] => consectetur [sit] => adipiscing [duis] => sit [ipsum] => duis [eiusmod] => ipsum [labore] => eiusmod [dolore] => labore [magna] => dolore [incididunt] => magna [tempor] => incididunt [sed] => tempor [elit] => sed [amet] => elit [aliqua] => amet )

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