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run code in 200+ php & hhvm versions
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<?php parse_str('a[', $out); var_dump($out);
Output for 4.3.2 - 7.2.0
array(1) { ["a_"]=> string(0) "" }
Output for 4.3.0 - 4.3.1
Warning: parse_str() [http://www.php.net/function.parse-str]: Missing ] in a variable in /in/YGS8o on line 3 array(1) { ["a"]=> array(0) { } }