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<?php $a = array( 'a' => 1, 'b' => 2 ); var_dump($a['h']); var_dump($a[null]== true);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "h" in /in/4HjUO on line 8 NULL Warning: Undefined array key "" in /in/4HjUO on line 9 bool(false)

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