php使用curl并发减少后端访问时间的方法分析_php技巧

在我们平时的程序中难免出现同时访问几个接口的情况，平时我们用curl进行访问的时候，一般都是单个、顺序访问，假如有3个接口，每个接口耗时500毫 秒那么我们三个接口就要花费1500毫秒了，这个问题太头疼了严重影响了页面访问速度，有没有可能并发访问来提高速度呢？今天就简单的说一下，利用 curl并发来提高页面访问速度，

1、老的curl访问方式以及耗时统计

<?phpfunction curl_fetch($url, $timeout=3){  $ch = curl_init();  curl_setopt($ch, CURLOPT_URL, $url);  curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  $data = curl_exec($ch);  $errno = curl_errno($ch);  if ($errno>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",   "sina"=>"http://www.sina.com.cn",   ); $time_start = microtime_float(); $data=array(); foreach ($url_arr as $key=>$val) {   $data[$key]=curl_fetch($val); } $time_end = microtime_float(); $time = $time_end - $time_start; echo "耗时:{$time}";?>

耗时:0.614秒

2、curl并发访问方式以及耗时统计

<?phpfunction curl_multi_fetch($urlarr=array()){  $result=$res=$ch=array();  $nch = 0;  $mh = curl_multi_init();  foreach ($urlarr as $nk => $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 performing 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 - $time_start; echo "耗时:{$time}";?>

耗时:0.316秒

帅气吧整个页面访问后端接口的时间节省了一半

3、curl相关参数

curl_close — Close a cURL session
curl_copy_handle — Copy a cURL handle along with all of its preferences
curl_errno — Return the last error number
curl_error — Return a string containing the last error for the current session
curl_exec — Perform a cURL session
curl_getinfo — Get information regarding a specific transfer
curl_init — Initialize a cURL session
curl_multi_add_handle — Add a normal cURL handle to a cURL multi handle
curl_multi_close — Close a set of cURL handles
curl_multi_exec — Run the sub-connections of the current cURL handle
curl_multi_getcontent — Return the content of a cURL handle if CURLOPT_RETURNTRANSFER is set
curl_multi_info_read — Get information about the current transfers
curl_multi_init — Returns a new cURL multi handle
curl_multi_remove_handle — Remove a multi handle from a set of cURL handles
curl_multi_select — Wait for activity on any curl_multi connection
curl_setopt_array — Set multiple options for a cURL transfer
curl_setopt — Set an option for a cURL transfer
curl_version — Gets cURL version information

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php curl用法总结》、《PHP数组(Array)操作技巧大全》、《PHP数据结构与算法教程》、《PHP数学运算技巧总结》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。