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run code in 150+ php & hhvm versions
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<? if(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){   //存在的話將HTTP_X_FORWARDED_FOR拆解取出第一個IP即可   $proxy_ip = split(',',$_SERVER['HTTP_X_FORWARDED_FOR']);   $ip = $proxy_ip[0]; }else {   //不存在則使用REMOTE_ADDR來得到訪客IP   $ip = $_SERVER['REMOTE_ADDR']; } ?>
based on qHlVK
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected '  ' (T_STRING) in /in/IgPYa on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<? if(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){   //存在的話將HTTP_X_FORWARDED_FOR拆解取出第一個IP即可   $proxy_ip = split(',',$_SERVER['HTTP_X_FORWARDED_FOR']);   $ip = $proxy_ip[0]; }else {   //不存在則使用REMOTE_ADDR來得到訪客IP   $ip = $_SERVER['REMOTE_ADDR']; } ?>