<?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);
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Value for `_results` contains invalid data `array`