3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array(1, 2, 1, 3); array_unique(&$arr); var_dump($arr);
Output for 5.4.0 - 5.4.40, 5.5.24, 5.6.8
Fatal error: Call-time pass-by-reference has been removed in /in/CjEK7 on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Deprecated: Call-time pass-by-reference has been deprecated in /in/CjEK7 on line 5 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(1) [3]=> int(3) }
Output for 5.2.7 - 5.2.17
Warning: Call-time pass-by-reference has been deprecated in /in/CjEK7 on line 5 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(1) [3]=> int(3) }
Output for 5.2.5 - 5.2.6
Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of array_unique(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file in /in/CjEK7 on line 5 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(1) [3]=> int(3) }
Output for 5.2.1 - 5.2.4
Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of array_unique(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. in /in/CjEK7 on line 5 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(1) [3]=> int(3) }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0
Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of array_unique(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in /in/CjEK7 on line 5 array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(1) [3]=> int(3) }

preferences:
224.68 ms | 1396 KiB | 132 Q