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@ 2016-08-22T16:06:41Z

<?php
$food = Array
(
    'Joe' => Array
        (
            0 => 'Pizza',
            1 => 'Pasta',
            2 => 'Lasagne',
            3 => 'Tacos',
            4 => 'Hamburger'
        ),

    'Conny' => Array
        (
            0 => 'Pizza',
            1 => 'Pasta',
            2 => 'Lasagne',
            3 => 'Tacos',
            4 => 'Hamburger'
        ),

    'John' => Array
        (
            0 => 'Pizza',
            1 => 'Pasta'
        ),

    'Fred' => Array
        (
            0 => 'Pizza',
            1 => 'Pasta',
            2 => 'Soup',
            3 => 'Fish'
        ),

    'Greg' => Array
        (
            0 => 'Sushi'
        )
);

uasort($food, function($a, $b) {
    return count($b) <=> count($a);
});

$used = array();
foreach($food as $kl => $pl) {
    foreach($pl as $k => $p) {
        if(!in_array($p, $used)) {
            $used[] = $p;
        } else {
            unset($food[$kl][$k]);
        }
    }
}
$food = array_filter($food);
var_dump($food);

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: array(3) { ["Joe"]=> array(5) { [0]=> string(5) "Pizza" [1]=> string(5) "Pasta" [2]=> string(7) "Lasagne" [3]=> string(5) "Tacos" [4]=> string(9) "Hamburger" } ["Fred"]=> array(2) { [2]=> string(4) "Soup" [3]=> string(4) "Fish" } ["Greg"]=> array(1) { [0]=> string(5) "Sushi" } }
Output for 5.6.0 - 5.6.25: Parse error: syntax error, unexpected '>' in /in/LjpGD on line 43
Process exited with code 255.

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106.87 ms | 1582 KiB | 4 Q