Online PHP editor | output for Slc7j

@ 2017-09-03T09:35:59Z

<?php
$arr = [];
$arr['One'] = 1;
$arr['Two'] = 2;
$arr['Three'] = 3;
$arr['Four'] = 4;

function generatePermutations($array) {
    $permutations = [];
    $pairs = [];
    $i = 0;
    foreach ($array as $key => $value) {
        foreach ($array as $key2 => $value2) {
            if ($key === $key2) continue;
            $permutations[] = [$key, $key2];
        }
        array_shift($array);
    }
    foreach ($permutations as $key => $value) {
        foreach ($permutations as $key2=>$value2) {
            if (!in_array($value2[0], $value) && !in_array($value2[1], $value)) {
                $pairs[] = [$value, $value2];
            }
        }
        array_shift($permutations);
    }
    return $pairs;
}
print_r(generatePermutations($arr));

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: Array ( [0] => Array ( [0] => Array ( [0] => One [1] => Two ) [1] => Array ( [0] => Three [1] => Four ) ) [1] => Array ( [0] => Array ( [0] => One [1] => Three ) [1] => Array ( [0] => Two [1] => Four ) ) [2] => Array ( [0] => Array ( [0] => One [1] => Four ) [1] => Array ( [0] => Two [1] => Three ) ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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