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run code in 150+ php & hhvm versions
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<?php $t = 'lang="cs-CZ"'; var_dump(preg_match("~lang=(\"|')cs(_\-)cz(\"|')~i", $html, $langPreg));
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: html in /in/c0qIq on line 4 int(0)
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: html in /in/c0qIq on line 4 int(0)