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run code in 150+ php & hhvm versions
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<?php $string = 'This is a string!'; $i = 0; var_dump(array_filter(str_split($string), function($val) use ($i) { return ++$i % 2; }));
based on oDh0m
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(17) { [0]=> string(1) "T" [1]=> string(1) "h" [2]=> string(1) "i" [3]=> string(1) "s" [4]=> string(1) " " [5]=> string(1) "i" [6]=> string(1) "s" [7]=> string(1) " " [8]=> string(1) "a" [9]=> string(1) " " [10]=> string(1) "s" [11]=> string(1) "t" [12]=> string(1) "r" [13]=> string(1) "i" [14]=> string(1) "n" [15]=> string(1) "g" [16]=> string(1) "!" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/Qm0O8 on line 5
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 in /in/Qm0O8 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Qm0O8 on line 5
Process exited with code 255.