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run code in 200+ php & hhvm versions
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<?php $source = [ 0=>[ ['foo'=>['bar']]], 1=>[ ['biz'=>'baz'], ['a'=>'b']] ]; $return = []; $return =call_user_func_array('array_merge', $source); var_dump($return);
based on fSUJt
Output for 5.4.0 - 7.2.0
array(3) { [0]=> array(1) { ["foo"]=> array(1) { [0]=> string(3) "bar" } } [1]=> array(1) { ["biz"]=> string(3) "baz" } [2]=> array(1) { ["a"]=> string(1) "b" } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/v9XjR on line 3
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/v9XjR on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/v9XjR on line 3
Process exited with code 255.