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<?php $a = array_diff(array('key1' => 'value1', 'key2' => 'value2'), array('key3' => 'value3', 'key2' => 'value4')); var_dump($a);
Output for 4.3.0 - 7.2.0
array(2) { ["key1"]=> string(6) "value1" ["key2"]=> string(6) "value2" }