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run code in 200+ php & hhvm versions
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<?php $a = []; $a['d'] = true; $var = $a['b'] ?: 'c'; var_dump($var);
based on L5UVX
Output for 5.4.0 - 7.3.0rc4
Notice: Undefined index: b in /in/bEC3D on line 8 string(1) "c"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/bEC3D 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/bEC3D on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/bEC3D on line 3
Process exited with code 255.