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run code in 150+ php & hhvm versions
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<?php $input_array = [['a', 'b', 'c'], ['d', 'e', 'f']]; array_walk($input_array, function(&$element) { return join(',',$element); }); var_dump($input_array);
based on bB4VJ
Output for 5.4.0 - 7.1.0
array(2) { [0]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } [1]=> array(3) { [0]=> string(1) "d" [1]=> string(1) "e" [2]=> string(1) "f" } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/YT2WA on line 2
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 '[' in /in/YT2WA on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/YT2WA on line 2
Process exited with code 255.