PHP method for retrieving search keywords by visitor

PHP's method of retrieving search keywords by visitor & lt ;? Phpclasskeyword {publicfunctiongetKeyword ($ referer) {if (strpos ($ referer, & quot; www.baidu.com & quot;) & gt;-1) {$ keyword $ this-& gt; getba PHP method for retrieving search keywords by visiting a visitor

 -1) {$ keyword = $ this-> getbaidukeyword ($ referer);} else if (strpos ($ referer ," http://www.google.com ")>-1) {$ keyword = $ this-> getgooglekeyword ($ referer);} else if (strpos ($ referer ," http://www.soso.com ")>-1) {$ keyword = $ this-> getsosokeyword ($ referer);} else if (strpos ($ referer ," http://www.sogou.com ")>-1) {$ keyword = $ this-> getsogoukeyword ($ referer);} return $ keyword;} // Obtain Baidu keyword private function getbaidukeyword ($ str) {$ s = strpos ($ str, 'wd = '); if ($ s>-1) {$ str = substr ($ str, $ s + 3 ); $ e = strpos ($ str, '&'); if ($ e>-1) {$ str = substr ($ str, 0, $ e );} $ str = rawurldecode ($ str);} return $ str;} // Obtain the Google keyword private function getgooglekeyword ($ str) {$ s = strpos ($ str, '& q ='); if ($ s>-1) {$ str = substr ($ str, $ s + 3); $ e = strpos ($ s Tr, '&'); if ($ e>-1) {$ str = substr ($ str, 0, $ e );} $ str = rawurldecode ($ str);} return $ str;} // Obtain the SOSO keyword private function getsosokeyword ($ str) {$ s = strpos ($ str ,'? W = '); if ($ s>-1) {$ str = substr ($ str, $ s + 3); $ e = strpos ($ str, '&'); if ($ e>-1) {$ str = substr ($ str, 0, $ e) ;}$ str = rawurldecode ($ str );} else {$ s = strpos ($ str, '& w ='); if ($ s>-1) {$ str = substr ($ str, $ s + 3 ); $ e = strpos ($ str, '&'); if ($ e>-1) {$ str = substr ($ str, 0, $ e );} $ str = rawurldecode ($ str) ;}return $ str ;}// obtain the sogou keyword private function getsogoukeyword ($ str) {$ s = strpos ($ str, 'query = '); if ($ s>-1) {$ str = substr ($ str, $ s + 6 ); $ E = strpos ($ str, '&'); if ($ e>-1) {$ str = substr ($ str, 0, $ e );} $ str = rawurldecode ($ str);} return $ str ;}}?>