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<?php $a = array(15 => null, 16 => true); var_dump(array_key_exists(15, $a)); var_dump(isset($a[15])); var_dump(array_key_exists(16, $a)); var_dump(isset($a[16]));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) bool(true) bool(true)

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