【汇总】PHP常用小函数【概率，毫秒，IP】

/**  * 取得客户端IP  */function get_client_ip(){   if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))       $ip = getenv("HTTP_CLIENT_IP");   else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))       $ip = getenv("HTTP_X_FORWARDED_FOR");   else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))       $ip = getenv("REMOTE_ADDR");   else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))       $ip = $_SERVER['REMOTE_ADDR'];   else       $ip = "unknown";   return($ip);}

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