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<?php $a1 = array('5'); $a2 = array('3'); var_dump(array_diff($a1, $a2)); var_dump($a1-$a2);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(1) "5" } Fatal error: Uncaught TypeError: Unsupported operand types: array - array in /in/8bNAF:5 Stack trace: #0 {main} thrown in /in/8bNAF on line 5
Process exited with code 255.

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