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<?php $arr1 = $arr2 = array( /* 1 */ array( 'A' , 'C' , 'B' ), /* 2 */ array( 'B' , 'A' , 'C' ), ); usort($arr1, 'natsort'); var_dump($arr1); foreach ($arr2 as &$a) { sort($a); } var_dump($arr2);
based on nAAe1
Output for hhvm-3.12.0, 7.0.0 - 7.1.0
Warning: natsort() expects exactly 1 parameter, 2 given in /in/3VKKu on line 7 array(2) { [0]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "C" [2]=> string(1) "B" } [1]=> array(3) { [0]=> string(1) "B" [1]=> string(1) "A" [2]=> string(1) "C" } } array(2) { [0]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } [1]=> &array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.6.28
Warning: natsort() expects exactly 1 parameter, 2 given in /in/3VKKu on line 7 array(2) { [0]=> array(3) { [0]=> string(1) "B" [1]=> string(1) "A" [2]=> string(1) "C" } [1]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "C" [2]=> string(1) "B" } } array(2) { [0]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } [1]=> &array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } }
Output for 5.2.1 - 5.2.17
Warning: Wrong parameter count for natsort() in /in/3VKKu on line 7 array(2) { [0]=> array(3) { [0]=> string(1) "B" [1]=> string(1) "A" [2]=> string(1) "C" } [1]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "C" [2]=> string(1) "B" } } array(2) { [0]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } [1]=> &array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } }
Output for 5.0.0 - 5.2.0
Warning: Wrong parameter count for natsort() in /in/3VKKu on line 7 array(2) { [0]=> array(3) { [0]=> string(1) "B" [1]=> string(1) "A" [2]=> string(1) "C" } [1]=> array(3) { [0]=> string(1) "A" [1]=> string(1) "C" [2]=> string(1) "B" } } array(2) { [0]=> &array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } [1]=> &array(3) { [0]=> string(1) "A" [1]=> string(1) "B" [2]=> string(1) "C" } }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/3VKKu on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/3VKKu on line 10
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/3VKKu on line 10
Process exited with code 255.