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<?php var_dump(array_diff_assoc( array( 'ZWEI', 'foo' => 'FOO', 'bar' => 'BAR', 2 => 'ZWEI', ), array( 'ZWEI', 'foo' => 'FOO', 'bar' => 'BAR', 3 => 'ZWEI', ) ));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [2]=> string(4) "ZWEI" }