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<?php $x = false; $y = json_decode($x,true); var_dump(array_key_exists( 'x', $y));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /in/gerDS:6 Stack trace: #0 {main} thrown in /in/gerDS on line 6
Process exited with code 255.

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