Online PHP editor | output for UZueA

@ 2019-04-20T09:24:46Z

<?php
$array = array (
    'parent_id' => 
    array (
        9 => 
        array (
            0 => 12
        ),
        20 => 
        array (
            0 => 25,
            1 => 22
        ),
        21 => 
        array (
            0 => 23,
            1 => 24
        )
    )
);
// re-index to 0
$array = array_values($array['parent_id']);
// sort so the longest arrays are first
usort($array, function ($a, $b) { return count($b) - count($a); });
// output array
$pairs = array();
for ($i = 0; $i < count($array) - 1; $i += 2) {
    for ($j = 0; $j < min(count($array[$i]), count($array[$i+1])); $j++) {
        $pairs[] = array($array[$i][$j], $array[$i+1][$j]);
    }
}
print_r($pairs);

Output for 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 - 8.5.1: Array ( [0] => Array ( [0] => 25 [1] => 23 ) [1] => Array ( [0] => 22 [1] => 24 ) )
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.
Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Array ( [0] => Array ( [0] => 23 [1] => 25 ) [1] => Array ( [0] => 24 [1] => 22 ) )

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