恒富网

下面是一个测试代码：开启10个线程抓取百度内容，分别比较时间，多线程时间为1.520003080368秒，foreach循环抓取时间为3.1731760501862秒左右，cpu为四核处理器

<?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, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2)');       
    $result = curl_exec($curl);       
    curl_close($curl);       
    return $result;   
}  
for ($i = 0; $i < 10; $i++) {     
    $urls[] = 'http://www.baidu.com/s?wd='. 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()) {         
        var_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) {     
    var_dump(model_http_curl_get($url)); 
} 
$e = microtime(true); 
echo "For循环耗时：".($e-$t)."秒<br>";