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<?php $a = ['foo' => 'bar', 2 => 200]; var_dump(empty($a['foo'])); var_dump(empty($a['asdfasdf'])); var_dump(empty($a[2])); var_dump(empty($a[12]));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) bool(false) bool(true)

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