<?php
phpinfo();

<?php
header("Content-type: text/html; charset=utf-8"); 
class demo extends Thread {
    public $url;
    public $result;
    public function __construct($url) {
        $this->url = $url;
    }
    
    public function run() {
        if ($this->url) {
            $this->result = http_curl_get($this->url);
        }
    }
}
function 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 demo($url);
    $workers[$key]->start();
}
foreach ($workers as $key=>$worker) {
    while($workers[$key]->isRunning()) {
        usleep(100);  
    }
    if ($workers[$key]->join()) {
        $workers[$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) {
    http_curl_get($url);
}
$e = microtime(true);
echo "For循环耗时：".($e-$t)."秒<br>";