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run code in 150+ php & hhvm versions
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<?php $url = "http://www.groupon.com"; if ( $url_array = parse_url($url) ) { if ( !isset($url_array["scheme"]) ) { $url = "http://{$url}"; } } echo $url;
Output for 4.3.0 - 7.1.0
http://www.groupon.com