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<?php $a = []; $a['a'] = 'a'; vardump(isset($a['a'])); vardump(isset($a['a']['b'])); vardump(isset($a['a']['b']['c']));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function vardump() in /in/nWbJM:4 Stack trace: #0 {main} thrown in /in/nWbJM on line 4
Process exited with code 255.

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