3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = ['foo', 'bar']; var_dump($data); $filtered = array_filter($data, function (&$value) { $value = (bool) $value; return true; }); var_dump($filtered);
Output for 8.4.1 - 8.4.12
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } Warning: {closure:/in/bERrp:7}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 7 Warning: {closure:/in/bERrp:7}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 7 array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 7 Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 7 array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 11 Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 11 array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }
preferences:
130.89 ms | 412 KiB | 5 Q