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<?php $arr=[' ', ' foo ', ' ', ' bar ', 'baz ', ' ']; function something(array $arg) { array_filter($arg, function(&$el){return strlen($el=trim($el));}); } var_dump($arr); something($arr); var_dump($arr);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(6) { [0]=> string(3) " " [1]=> string(7) " foo " [2]=> string(3) " " [3]=> string(8) " bar " [4]=> string(6) "baz " [5]=> string(2) " " } Warning: {closure}(): Argument #1 ($el) must be passed by reference, value given in /in/K7bRf on line 7 Warning: {closure}(): Argument #1 ($el) must be passed by reference, value given in /in/K7bRf on line 7 Warning: {closure}(): Argument #1 ($el) must be passed by reference, value given in /in/K7bRf on line 7 Warning: {closure}(): Argument #1 ($el) must be passed by reference, value given in /in/K7bRf on line 7 Warning: {closure}(): Argument #1 ($el) must be passed by reference, value given in /in/K7bRf on line 7 Warning: {closure}(): Argument #1 ($el) must be passed by reference, value given in /in/K7bRf on line 7 array(6) { [0]=> string(3) " " [1]=> string(7) " foo " [2]=> string(3) " " [3]=> string(8) " bar " [4]=> string(6) "baz " [5]=> string(2) " " }
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array(6) { [0]=> string(3) " " [1]=> string(7) " foo " [2]=> string(3) " " [3]=> string(8) " bar " [4]=> string(6) "baz " [5]=> string(2) " " } array(6) { [0]=> string(3) " " [1]=> string(7) " foo " [2]=> string(3) " " [3]=> string(8) " bar " [4]=> string(6) "baz " [5]=> string(2) " " }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
array(6) { [0]=> string(3) " " [1]=> string(7) " foo " [2]=> string(3) " " [3]=> string(8) " bar " [4]=> string(6) "baz " [5]=> string(2) " " } array(6) { [0]=> string(0) "" [1]=> string(3) "foo" [2]=> string(0) "" [3]=> string(3) "bar" [4]=> string(3) "baz" [5]=> string(0) "" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/K7bRf on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/K7bRf on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/K7bRf on line 3
Process exited with code 255.
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