La concurrence PHP utilise la concurrence curl pour réduire le temps d'accès au backend

# curl_multi_add_handle
# curl_multi_close
# curl_multi_exec
# curl_multi_getcontent
# curl_multi_info_read
# curl_multi_init
# curl_multi_remove_handle
# curl_multi_select

/*
Here's a quick and dirty example for curl-multi from PHP, tested on PHP 5.0.0RC1 CLI / FreeBSD 5.2.1
*/

$connomains = array(
"http://www.cnn.com/",
"http://www.canada.com/",
"http://www.yahoo.com/"
);

$mh = curl_multi_init();

foreach ($connomains as $i => $url) {
     $conn[$i]=curl_init($url);
      curl_setopt($conn[$i],CURLOPT_RETURNTRANSFER,1);
      curl_multi_add_handle ($mh,$conn[$i]);
}

do { $n=curl_multi_exec($mh,$active); } while ($active);

foreach ($connomains as $i => $url) {
      $res[$i]=curl_multi_getcontent($conn[$i]);
      curl_close($conn[$i]);
}

print_r($res);

  do {
                        $mrc = curl_multi_exec($mh,$active);
                } while ($mrc == CURLM_CALL_MULTI_PERFORM);
                while ($active and $mrc == CURLM_OK) {
                        if (curl_multi_select($mh) != -1) {
                                do {
                                        $mrc = curl_multi_exec($mh, $active);
                                } while ($mrc == CURLM_CALL_MULTI_PERFORM);
                        }
                }

$requests = array('http://www.baidu.com', 'http://www.google.com');  
$main    = curl_multi_init();  
$results = array();  
$errors  = array();  
$info = array();  
$count = count($requests);  
for($i = 0; $i < $count; $i++)   
{    
$handles[$i] = curl_init($requests[$i]);    
var_dump($requests[$i]);    
curl_setopt($handles[$i], CURLOPT_URL, $requests[$i]);    
curl_setopt($handles[$i], CURLOPT_RETURNTRANSFER, 1);    
curl_multi_add_handle($main, $handles[$i]);  
}  
$running = 0;   
do {    
curl_multi_exec($main, $running);  
}   
while($running > 0);   
for($i = 0; $i < $count; $i++)  
{  $results[] = curl_multi_getcontent($handles[$i]);    
$errors[]  = curl_error($handles[$i]);    
$info[]    = curl_getinfo($handles[$i]);    
curl_multi_remove_handle($main, $handles[$i]);  
}  
curl_multi_close($main);  
var_dump($results);  
var_dump($errors);  
var_dump($info);

<?php function 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}";   
?>

<?php   
function 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])) == &#39;&#39;) {               
$res[$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}";   
?>