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<?php $a=array('a'=>1); $a=array('a'=>2); var_dump(array_merge($a,$b), array_merge($b,$a));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $b in /in/ML402 on line 4 Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, null given in /in/ML402:4 Stack trace: #0 /in/ML402(4): array_merge(Array, NULL) #1 {main} thrown in /in/ML402 on line 4
Process exited with code 255.

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