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run code in 150+ php & hhvm versions
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<?php $a = ["úù" => "u"]; foreach($a as $k => $v); echo preg_replace('/['. $k . ']/', $v, 'olóáé');
Output for 5.4.0 - 7.1.0
olu�u�u�
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/GilNV 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/GilNV on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/GilNV on line 3
Process exited with code 255.