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run code in 200+ php & hhvm versions
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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');
based on hMOHu
Output for 7.0.0 - 7.2.0
string(1) "a" string(1) "a" Notice: Undefined index: j in /in/ahK7Y on line 7 string(5) "empty" string(5) "empty"
Output for 5.4.10 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/ahK7Y on line 6
Process exited with code 255.
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/ahK7Y on line 3
Process exited with code 255.