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<?php $input = Array( Array ( 0 => 1 ), Array ( 0 => 2 ) ); $result = call_user_func_array("array_merge", $input); var_export($result); var_export($input);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array ( 0 => 1, 1 => 2, )array ( 0 => array ( 0 => 1, ), 1 => array ( 0 => 2, ), )