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<?php $a = ['i' => 'a']; var_dump($a['i'] ?: 'empty'); var_dump($a['i'] ?? 'empty'); var_dump($a['j'] ?: 'empty'); var_dump($a['j'] ?? 'empty'); var_dump($a['j'] ?? $a['i'] ?: 'empty');
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "a" string(1) "a" Warning: Undefined array key "j" in /in/A0kJ6 on line 7 string(5) "empty" string(5) "empty" string(1) "a"

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