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run code in 200+ php & hhvm versions
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<?php $arr = ['test'=>'213']; $foo = [ 'rate'=> ($arr['rate'] ?: null) ]; var_dump($foo);
based on PaE3I
Output for 5.4.0 - 7.2.0
Notice: Undefined index: rate in /in/2GEnP on line 5 array(1) { ["rate"]=> NULL }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/2GEnP on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/2GEnP on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/2GEnP on line 3
Process exited with code 255.