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<?php $arr = []; $arr['key'] = NULL; var_dump(isset($arr['key'])); //bool(false) var_dump(is_null($arr['key'])); //bool(true) var_dump(is_null($arr['any_key']));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) Warning: Undefined array key "any_key" in /in/g5d1V on line 12 bool(true)

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