Php URL redirection header () function

// URL redirection Function redirect ($ url, $ time = 0, $ msg = "){ // Multi-line URL support $ Url = str_replace (array ("\ n", "\ r"), ", $ url ); If (empty ($ msg )) $ Msg = "The system will automatically jump to {$ url}! after {$ time} seconds }!"; If (! Headers_sent ()){ // Redirect If (0 ===$ time ){ Header ('Location: '. $ url ); } Else { Header ("refresh: {$ time}; url = {$ url }"); Echo ($ msg ); } Exit (); } Else { $ Str = ""; If ($ time! = 0) $ Str. = $ msg; Exit ($ str ); } } // Url redirection 2 Function redirect ($ url ){ Echo" "; Exit (); }

HTTP header information

That is, use the php header function. The HEADER function in PHP is used to send control commands that should have been specified by the HTTP protocol to the browser through the WEB server, such as declaring the type of returned information ("Context-type: xxx/xxx "), page attributes (" No cache "," Expire "), and so on.

Use the HTTP header to redirect PHP to another page as follows:

<? Php $ Url = "www.111cn.net "; If (! Empty ($ url )) { Header ("HTTP/1.1 303 See Other"); // This statement can be left empty Header ("Location: $ url "); } ?>

Note that "Localtion:" is followed by a space, and a comprehensive function is organized below.

/** * Get_redirect_url () * Gets the address that the provided URL redirects, * Or FALSE if there's no redirect. * * @ Param string $ url * @ Return string */ Function get_redirect_url ($ url ){ $ Redirect_url = null; $ Url_parts = @ parse_url ($ url ); If (! $ Url_parts) return false; If (! Isset ($ url_parts ['host']) return false; // can't process relative URLs If (! Isset ($ url_parts ['path']) $ url_parts ['path'] = '/' $ Sock = fsockopen ($ url_parts ['host'], (isset ($ url_parts ['port'])? (Int) $ url_parts ['port']: 80), $ errno, $ errstr, 30 ); If (! $ Sock) return false; $ Request = "HEAD". $ url_parts ['path']. (isset ($ url_parts ['query'])? '? '. $ Url_parts ['query']: '')." HTTP/1.1rn "; $ Request. = 'host: '. $ url_parts ['host']. "rn "; $ Request. = "Connection: Closernrn "; Fwrite ($ sock, $ request ); $ Response ='' While (! Feof ($ sock) $ response. = fread ($ sock, 8192 ); Fclose ($ sock ); If (preg_match ('/^ Location: (. + ?) $/M', $ response, $ matches )){ Return trim ($ matches [1]); } Else { Return false; } } /** * Get_all_redirects () * Follows and collects all redirects, in order, for the given URL. * * @ Param string $ url * @ Return array */ Function get_all_redirects ($ url ){ $ Redirects = array (); While ($ newurl = get_redirect_url ($ url )){ If (in_array ($ newurl, $ redirects )){ Break; } $ Redirects [] = $ newurl; $ Url = $ newurl; } Return $ redirects; } /** * Get_final_url () * Gets the address that the URL ultimately leads. * Returns $ url itself if it isn't a redirect. * * @ Param string $ url * @ Return string */ Function get_final_url ($ url ){ $ Redirects = get_all_redirects ($ url ); If (count ($ redirects)> 0 ){ Return array_pop ($ redirects ); } Else { Return $ url; } }