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run code in 200+ php & hhvm versions
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<?php $input = Array( Array ( 'ax' => 1 ), Array ( 'as' => 2 ) ); $result = call_user_func_array("array_merge", $input); var_export($result);
Output for 4.3.0 - 7.2.0
array ( 'ax' => 1, 'as' => 2, )