Regarding PHP multi-threading processing issues

The following is about PHP multi-threading problems, PHP's pthreads extension and curl_multi_init function. When you encounter such problems and cannot solve them, take a look at how others solved them.

Installing php real multi-thread extension pthreads tutorial under windows

Extension address: http://docs.php.net/manual/zh/book .pthreads.php
Notes
php5.3 or above, and it is a thread-safe version. The compilers used by apache and php must be consistent.
Check Thread Safety through phpinfo() if it is enabled, it is a thread-safe version.
You can know the compiler used by viewing the Compiler item through phpinfo(). Mine is: MSVC9 (Visual C++ 2008).
Use environment
32-bit windows xp sp3, wampserver2.2d (php5.3.10-vc9 + apache2.2.21-vc9).
1. Download pthreads extension
Download address: http://windows.php.net/downloads/pecl/releases/pthreads
According to my environment, I downloaded pthreads-2.0.8-5.3- ts-vc9-x86.
2.0.8 represents the version of pthreads.
5.3 represents the php version.
ts means that php requires a thread-safe version.
vc9 means that php needs to be compiled with Visual C++ 2008 compiler.
x86 means 32-bit

2. Install pthreads extension
Copy php_pthreads.dll to the directory bin\php\ext\. (My path is D:\wamp\bin\php\php5.3.10\ext)
Copy pthreadVC2.dll to the directory bin\php\. (My path is D:\wamp\bin\php\php5.3.10)
Copy pthreadVC2.dll to the directory C:\windows\system32.
Open the php configuration file php.ini. Add extension=php_pthreads.dll
prompt at the end! Windows systems need to add the path of pthreadVC2.dll to the PATH environment variable. My Computer--->right mouse button--->Properties--->Advanced--->Environment Variables--->System Variables--->Find the path named Path---> ;Edit--->Add the full path of pthreadVC2.dll at the end of the variable value (mine is C:\WINDOWS\system32\pthreadVC2.dll).
3. Test pthreads extension

class AsyncOperation extends \Thread {
    public function __construct($arg){
        $this->arg = $arg;
    }
    public function run(){
        if($this->arg){
            printf("Hello %s\n", $this->arg);
        }
    }
}
$thread = new AsyncOperation("World");
if($thread->start())
    $thread->join();
?>

Hello World appears when running the above code, indicating that the pthreads extension is installed successfully!

Attached is a simple example of Thinkphp3.2.2

<?php
namespace Home\Controller;
class test extends \Thread {
    public $url;
    public $result;
    
    public function __construct($url) {
        $this->url = $url;
    }
    
    public function run() {
        if ($this->url) {
            $this->result = model_http_curl_get($this->url);
        }
    }
}
function model_http_curl_get($url) {
    $curl = curl_init();  
    curl_setopt($curl, CURLOPT_URL, $url);  
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
    curl_setopt($curl, CURLOPT_TIMEOUT, 5);  
    curl_setopt($curl, CURLOPT_USERAGENT, &#39;Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)&#39;);  
    $result = curl_exec($curl);  
    curl_close($curl);  
    return $result;  
}
for ($i = 0; $i < 10; $i++) {
    $urls[] = &#39;http://www.baidu.com/s?wd=&#39;. rand(10000, 20000);
}
/* 多线程速度测试 */
$t = microtime(true);
foreach ($urls as $key=>$url) {
    $workers[$key] = new test($url);
    $workers[$key]->start();
}
foreach ($workers as $key=>$worker) {
    while($workers[$key]->isRunning()) {
        usleep(100);  
    }
    if ($workers[$key]->join()) {
        dump($workers[$key]->result);
    }
}
$e = microtime(true);
echo "多线程耗时：".($e-$t)."秒<br>";  
/* 单线程速度测试 */
$t = microtime(true);
foreach ($urls as $key=>$url) {
    dump(model_http_curl_get($url));
}
$e = microtime(true);
echo "For循环耗时：".($e-$t)."秒<br>";

The test results are as follows:

Multi-threading time consumption: 2.8371710777282714844 seconds
For loop time consumption: 10.941586017608642578 seconds

curl_multi_init()

<?php
echo date("Y-m-d H:m:s",time());
echo " ";echo floor(microtime()*1000);
echo "<br>";$mtime = explode(" ", microtime());$mtime = $mtime[1].($mtime[0] * 1000);
$mtime2 = explode(".", $mtime);
$mtime = $mtime2[0]; echo $mtime;echo "<br>";
$urls=array(&#39;http://www.a.com&#39;, &#39;http://www.b.com&#39;, &#39;http://www.c.com&#39;, &#39;http://www.d.com&#39;,&#39;http://www.e.com&#39;); 
print_r(async_get_url($urls)); 
//[0]=>example1,[1]=>example2
echo "<br>";
echo date("Y-m-d H:m:s",time());
echo " ";
echo floor(microtime()*1000);
echo "<br>";
$mtime_ = explode(" ", microtime());
$mtime_ = $mtime_[1].($mtime_[0] * 1000);
$mtime2_ = explode(".", $mtime_);$mtime_ = $mtime2_[0]; 
echo $mtime_;
echo "<br>";
echo $mtime_ - $mtime;
function async_get_url($url_array, $wait_usec = 0)
{
if (!is_array($url_array))
return false;
$wait_usec = intval($wait_usec);
$data = array();
$handle = array();
$running = 0;
$mh = curl_multi_init(); 
// multi curl handler$i = 0;
foreach($url_array as $url) 
{
$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 // return don&#39;t printcurl_setopt($ch, CURLOPT_TIMEOUT, 30);
 curl_setopt($ch, CURLOPT_USERAGENT, &#39;Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)&#39;);
 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); 
 // 302 redirectcurl_setopt($ch, CURLOPT_MAXREDIRS, 7);
 curl_multi_add_handle($mh, $ch); 
 // 把 curl resource 放进 multi curl handler 里
 $handle[$i++] = $ch;}
 /* 执行 */
 do 
 {
 curl_multi_exec($mh, $running);
 if ($wait_usec > 0) 
 /* 每个 connect 要间隔多久 */
 usleep($wait_usec);
  // 250000 = 0.25 sec} while ($running > 0);/* 读取资料 */
  foreach($handle as $i => $ch) 
  {$content = curl_multi_getcontent($ch);
  $data[$i] = (curl_errno($ch) == 0) ? $content : false;}
  /* 移除 handle*/
  foreach($handle as $ch) {
  curl_multi_remove_handle($mh, $ch);
  }
  curl_multi_close($mh);
  return $data;}
  ?>

About curl_multi_init()

Generally speaking, when you think of using curl_multi_init(), the purpose is It is necessary to request multiple URLs at the same time instead of requesting them one by one, otherwise curl_init() will be needed.

However, when using curl_multi, you may encounter phenomena such as excessive CPU consumption and suspended animation of web pages. You can take a look at how to solve the problem of suspended animation caused by curl_multi.

Summary of steps for using curl_multi As follows:

Step 1: Call curl_multi_init
Step 2: Call curl_multi_add_handle in a loop
It should be noted in this step that the second parameter of curl_multi_add_handle is the subhandle from curl_init.
Step 3: Continuously call curl_multi_exec
Step 4: Cyclically call curl_multi_getcontent to obtain the results as needed
Step 5: Call curl_multi_remove_handle, and call curl_close for each word handle
Step 6: Call curl_multi_close

Explanation of the functions of each function:

curl_multi_init()
Initialize a curl batch handle resource.

curl_multi_add_handle()
Add separate curl handle resources to the curl batch session. The curl_multi_add_handle() function has two parameters. The first parameter represents a curl batch handle resource, and the second parameter represents a separate curl handle resource.

curl_multi_exec()
Parse a curl batch handle. The curl_multi_exec() function has two parameters. The first parameter represents a batch handle resource, and the second parameter is a parameter that refers to a value. Indicates the number of individual curl handle resources remaining that need to be processed.

curl_multi_remove_handle()
Remove a handle resource in the curl batch handle resource. The curl_multi_remove_handle() function has two parameters. The first parameter represents a curl batch handle resource, and the second parameter The parameter represents a separate curl handle resource.

curl_multi_close()
Close a batch handle resource.

curl_multi_getcontent()
When CURLOPT_RETURNTRANSFER is set, return the text stream of the obtained output.

curl_multi_info_read()
Get the relevant transmission information of the currently parsed curl.

This article is shared about PHP multi-threading issues. I hope it will be helpful to everyone. If you have any questions, you can leave your comments or suggestions. In the future, the editor will share a lot of articles about this kind of articles, so please pay more attention to them.

The above is the detailed content of Regarding PHP multi-threading processing issues. For more information, please follow other related articles on the PHP Chinese website!