PHP uses curl to reduce the time required to obtain third-party webpage content concurrently-PHP source code

PHP uses curl to concurrently reduce the time required to obtain third-party webpage content. in our ordinary programs, it is inevitable that we access several interfaces at the same time. when we use curl for access, generally, it is a single and sequential access. if there are three interfaces, each of which takes 500 milliseconds, it will take 1500 milliseconds for the three interfaces, this problem is too headache, seriously affecting the page access speed. Is it possible to improve the speed of concurrent access? Paste the code here and you will be able to see it at a glance.

1. old curl access methods and time consumption statistics

 0) {$ data = false;} curl_close ($ ch); return $ data;} function microtime_float () {list ($ usec, $ sec) = explode ("", microtime (); return (float) $ usec + (float) $ sec);} $ url_arr = array ("taobao" => "http://www.taobao.com ", "sohu" => "http://www.sohu.com", "lai18" => "http://www.lai18.com",); $ time_start = microtime_float (); $ data = array (); foreach ($ url_arr as $ key => $ val) {$ data [$ key] = curl_fetch ($ val);} $ time_end = Microtime_float (); $ time = $ time_end-$ time_start; echo "time consumed: {$ time}";?>

2. curl concurrent access mode and time consumption statistics

 $ Url) {$ timeout = 2; $ ch [$ nch] = curl_init (); curl_setopt_array ($ ch [$ nch], array (CURLOPT_URL => $ url, CURLOPT_HEADER => false, CURLOPT_RETURNTRANSFER => true, CURLOPT_TIMEOUT => $ timeout,); curl_multi_add_handle ($ mh, $ ch [$ nch]); ++ $ nch ;} /* wait for future Ming request */do {$ mrc = curl_multi_exec ($ mh, $ running);} while (CURLM_CALL_MULTI_PERFORM = $ mrc ); while ($ running & $ mrc = CURLM_ OK ){ // Wait for network if (curl_multi_select ($ mh, 0.5)>-1) {// pull in new data; do {$ mrc = curl_multi_exec ($ mh, $ running) ;}while (CURLM_CALL_MULTI_PERFORM ==$ mrc) ;}} if ($ mrc! = CURLM_ OK) {error_log ("CURL Data Error");}/* get data */$ nch = 0; foreach ($ urlarr as $ moudle => $ node) {if ($ err = curl_error ($ ch [$ nch]) = '') {$ res [$ nch] = curl_multi_getcontent ($ ch [$ nch]); $ result [$ moudle] = $ res [$ nch];} else {error_log ("curl error");} curl_multi_remove_handle ($ mh, $ ch [$ nch]); curl_close ($ ch [$ nch]); ++ $ nch;} curl_multi_close ($ mh); return $ result ;}$ url_arr = array ("taobao" =>" http://www.taobao.com "," Sohu "=>" http://www.sohu.com "," Sina "=>" http://www.sina.com.cn ",); Function microtime_float () {list ($ usec, $ sec) = explode (" ", microtime (); return (float) $ usec + (float) $ sec) ;}$ time_start = microtime_float (); $ data = curl_multi_fetch ($ url_arr); $ time_end = microtime_float (); $ time = $ time_end-$ time_start; echo "time consumed: {$ time}";?>