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<?php $data = array('key' => null); var_dump(isset($data['key'])); // unsafe var_dump(array_key_exists('key', $data)); // better, but still unsafe var_dump(array_key_exists('key', $data) && $data['key']); // safe
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) bool(false)

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