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<?php $arr1 = array(1, 2, 3, 4); $arr2 = array("a" => array(1, 2, 3)); $arr3 = array(); print_r(array_merge_recursive($arr3, $arr1, $arr2, $arr5));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $arr5 in /in/Vu0As on line 7 Fatal error: Uncaught TypeError: array_merge_recursive(): Argument #4 must be of type array, null given in /in/Vu0As:7 Stack trace: #0 /in/Vu0As(7): array_merge_recursive(Array, Array, Array, NULL) #1 {main} thrown in /in/Vu0As on line 7
Process exited with code 255.

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