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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);
Output for git.master, git.master_jit, rfc.property-hooks
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" } }

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