$ch = curl_init ("http://www.php.net/");
　　$fp = fopen ("php_homepage.txt", "w");
　　curl_setopt ($ch, CURLOPT_FILE, $fp);
　　curl_setopt ($ch, CURLOPT_HEADER, 0);
　　curl_exec ($ch);
　　curl_close ($ch);
　　fclose ($fp);
　　?>

int curl_init ([string url])

$ch = curl_init();
　　curl_setopt ($ch, CURLOPT_URL, "http://www.zend.com/");
　　curl_setopt ($ch, CURLOPT_HEADER, 0);
　　curl_exec ($ch);
　　curl_close ($ch);
　　?>

　bool curl_setopt (int ch, string option, mixed value)

<?php 
class MultiHttpRequest{ 
  public $urls = array(); 
  public $curlopt_header = 0; 
  public $cookie_file = ''; 
  public $collect_save_file = ''; 
  public $start_timestamp = ''; 
  public $end_timestamp = ''; 
  private $log_handle = ''; 
  private $collect_save_handle = ''; 
  private $db_conn = false; 
  private $pre_break_goods_id = ''; //上一次强制退出的id 
  private $per_break_brand_id = ''; //上一次更新到的brand_id 
  private $main_log_id = '';    //本次更新的主表日志id 
  private $start_time = ''; 
  public $login_session = ''; 
  public $date_char = ''; 
  private $mode = ''; 
  private $sql_log_handle = ''; 
  function __construct($upgrade_date='', $force_upt=false) 
  { 
     $this->mysql_init();   
     } 
    private function mysql_init(){ 
    $db_name = 'dbname'; 
    $db_user = 'name'; 
    $db_pass = 'pass'; 
    $db_host = 'localhost'; 
    $db_conn = mysql_connect($db_host, $db_user, $db_pass) ; 
    if(!$db_conn){ 
      echo '数据库连接失败!'; 
      exit; 
    } 
    $this->db_conn = $db_conn; 
    mysql_select_db($db_name); 
  } 
  public function init_login(){ 
    //第一步模拟登陆 
    $target_url = 'http://www.test.com/login.jsp'; 
    //post 提交的数据 
    $post_fields = array( 
    'username'  => '卓雅秀淘宝', 
    'password'  => 'joarshow.taobao.com', 
    't_url'    => '', 
    'Submit2'  => ' 登 录 ' 
    ); 
    //保存登陆的cookie 
    $cookie_file = dirname(__FILE__).'/cookie_'.time().'.txt'; 
    $this->cookie_file = $cookie_file; 
    //存cookie 
    $ch = curl_init($target_url); 
    curl_setopt($ch, CURLOPT_HEADER, 1); 
    //   curl_setopt($ch, CURLOPT_COOKIESESSION, 1); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt($ch, CURLOPT_POST, 1); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields); 
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file); 
    $login_contents = curl_exec($ch); 
    curl_close($ch); 
  } 
  /** 
   * 测试 
   * 
   * @param unknown_type $test_url 
   */ 
  public function get_one_file($test_url){ 
    $ch = curl_init($test_url); 
    curl_setopt($ch, CURLOPT_HEADER, 0); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt($ch,CURLOPT_COOKIE, $this->login_session); 
    curl_setopt($ch, CURLOPT_REFERER, 'http://www.test.com/welcome.shtml'); 
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)'); 
    $contents = curl_exec($ch); 
    curl_close($ch); 
    return $contents; 
  } 
  public function point_url_brand($url){ 
    $ch = curl_init($url); 
    curl_setopt($ch, CURLOPT_HEADER, 0); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt($ch,CURLOPT_COOKIE, $this->login_session); 
    curl_setopt($ch, CURLOPT_REFERER, 'http://www.test.com/product.shtml'); 
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)'); 
    $contents = curl_exec($ch); 
    //   echo htmlspecialchars($contents);exit; 
    curl_close($ch); 
    return $contents; 
  } 
} 

 /**
   * 根据地址抓取淘宝页面html代码
   * @param type $url 地址
   * @return boolean
   */
  public function getTaoBaoHtml($url) {
    if (empty($url)) {
      return false;
    }
    $ch = curl_init();
    // 设置 url
    curl_setopt($ch, CURLOPT_URL, $url);
    // 设置浏览器的特定header
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
      "User-Agent: {Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0}",
      "Accept: {text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8}",
      "Accept-Language: {zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3}",
      "Cookie:{cq=ccp%3D1; cna=a7suCzOmSTECAXgg9iCf4AtX; t=671b2069c7e8ac444da66d664a397a5f; tracknick=%5Cu4F0D%5Cu6653%5Cu8F8901;
 _tb_token_=nDiU1vCuzFd0; cookie2=c54709ffbe04a5ccb80283c34d6b00fa; 
pnm_cku822=128WsMPac%2FFS4KgNn%2BYfhzduo4U2NC0zh9cAS4%3D%
7CWUCLjKhqr873bOIFQcMecSw%3D%7CWMEKRlV%
2B3D9a6XWaidNWNQOSWXwaXugvQHzhxALh%7CX0
YLbX78NUR2b2DHoxnIqZENQqR35TBZbfQ5vooI0b6GHZA3U1kr%7CXkdILog
Cr878ZK9I%2B%2FE3QjAD3lFJJaAZRA%3D%3D%7CXUeMwMR2s%
2BTUQk8IPP5TNgWfUjQwonccMCxihTa0fRYgtjgfa4j6%7CXMY
K7F8liOvH3hMUpzXkiaU%2FJw%3D%3D}",
    ));
    // 页面内容我们并不需要
    curl_setopt($ch, CURLOPT_NOBODY, 0);
    // 只需返回HTTP header
    curl_setopt($ch, CURLOPT_HEADER, 0);
    // 返回结果，而不是输出它
    //curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    ob_start();
    curl_exec($ch);
    $html = ob_get_contents();
    ob_end_clean();
    curl_close($ch);
    return $html;
  }