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<?php $array = array( array( "a", "b", "c" => "def" ), array( "aa", "bb", "cc" => "def" ), array( "a", "b", "c" => "defg" ), array( "aa", "bb", "cc" => "def" ), array( "a", "b", "c" => "def" ), ); var_dump( array_unique( $array, SORT_REGULAR ) ); var_dump( array_intersect_key($array, array_unique(array_map('serialize', $array))) );
Output for 5.2.9 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> string(3) "def" } [1]=> array(3) { [0]=> string(2) "aa" [1]=> string(2) "bb" ["cc"]=> string(3) "def" } [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> string(4) "defg" } } array(3) { [0]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> string(3) "def" } [1]=> array(3) { [0]=> string(2) "aa" [1]=> string(2) "bb" ["cc"]=> string(3) "def" } [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> string(4) "defg" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.2.8
Warning: Wrong parameter count for array_unique() in /in/K7F7q on line 11 NULL array(3) { [0]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> string(3) "def" } [1]=> array(3) { [0]=> string(2) "aa" [1]=> string(2) "bb" ["cc"]=> string(3) "def" } [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" ["c"]=> string(4) "defg" } }
Output for 5.0.0 - 5.0.5
Warning: Wrong parameter count for array_unique() in /in/K7F7q on line 11 NULL Fatal error: Call to undefined function array_intersect_key() in /in/K7F7q on line 14
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Warning: Wrong parameter count for array_unique() in /in/K7F7q on line 11 NULL Fatal error: Call to undefined function: array_intersect_key() in /in/K7F7q on line 14
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Warning: Wrong parameter count for array_unique() in /in/K7F7q on line 11 NULL Fatal error: Call to undefined function: array_intersect_key() in /in/K7F7q on line 14
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Warning: Wrong parameter count for array_unique() in /in/K7F7q on line 11 NULL Fatal error: Call to undefined function: array_intersect_key() in /in/K7F7q on line 14