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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');
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(1) "a" string(1) "a" Warning: Undefined array key "j" in /in/ahK7Y on line 7 string(5) "empty" string(5) "empty"
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
string(1) "a" string(1) "a" Notice: Undefined index: j in /in/ahK7Y on line 7 string(5) "empty" string(5) "empty"
Output for 7.3.32 - 7.3.33
string(1) "a" string(1) "a" string(5) "empty" string(5) "empty"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Parse error: syntax error, unexpected '?' in /in/ahK7Y on line 6
Process exited with code 255.

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