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run code in 150+ php & hhvm versions
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<?php $array1 = array(0, 1); $array2 = array(&$array1); ob_start(function($str) use(&$array1) { static $i = 0; if ($i++ == 4) { unset($array1[0]); //unset($array1[1]); } return "$i: $str"; }, 1); var_dump($array2);
Output for 7.1.0
1: array(1) { 2: [0]=> 3: 4: &array(2) { 5: [0]=> 6: 7: int(0) 8: [1]=> 9: 10: int(1) 11: 12: } 13: } 14:
Output for 7.0.0 - 7.0.14
1: array(1) { 2: [0]=> 3: 4: &array(2) { 5: [0]=> 6: 7: UNKNOWN:0 8: [1]=> 9: 10: int(1) 11: 12: } 13: } 14:
Output for hhvm-3.10.0 - 3.12.0
1: array(1) { [0]=> &array(2) { [0]=> int(0) [1]=> int(1) } } 2:
Output for 5.4.0 - 5.6.28
1: array(1) { 2: [0]=> 3: 4: &array(2) { 5: [0]=> 6: 7: string(4) "8: 1a9: " 10: [1]=> 11: 12: int(1) 13: 14: } 15: } 16:
Output for 5.3.0 - 5.3.29
1: array(1) { [0]=> &array(2) { [0]=> int(0) [1]=> int(1) } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/4MIgJ on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/4MIgJ on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/4MIgJ on line 6
Process exited with code 255.