PHP用curl发送post请求

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<?php    
  $ch = curl_init();    
  $timeout = 5;    
  curl_setopt ($ch, CURLOPT_URL, 'http://www.domain.com/');    
  curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);    
  curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);   
  curl_setopt($ch, CURLOPT_POST, 1 );//设置post请求  
  curl_setopt($ch, CURLOPT_HEADER, 0 ) ;  
  curl_setopt($ch,CURLOPT_POSTFIELDS, "param=".$param);//param为请求的参数  
  $file_contents = curl_exec($ch);    
  curl_close($ch);    
  echo $file_contents;  
?>  
  
/** 
*  
* @Description 批量请求获得内容 
* @param @param array $urls 
* @param @param String $param 
* @return String 
*/  
public function remoteByRolling($urls, $param) {  
          
        if (! is_array ( $urls ) || count ( $urls ) == 0)  
        return false;  
    $queue = curl_multi_init ();  
    $map = array ();  
    foreach ( $urls as $url ) {  
        $this->remoteByPost ( $url, $param );  
        curl_multi_add_handle ( $queue, $this->ch );  
        $map [$url] = $this->$ch;  
    }  
          
    $active = null;  
    // 执行批处理句柄  
    do {  
        $mrc = curl_multi_exec ( $queue, $active );  
    } while ( $mrc == CURLM_CALL_MULTI_PERFORM );  
          
    while ( $active > 0 && $mrc == CURLM_OK ) {  
        //curl_multi_select:等待所有cURL批处理中的活动连接  
        if (curl_multi_select ( $queue, 0.5 ) != - 1) {  
            do {  
                $mrc = curl_multi_exec ( $queue, $active );  
            } while ( $mrc == CURLM_CALL_MULTI_PERFORM );  
        }  
    }  
          
    /* get data */  
    $responses = array ();  
    foreach ( $map as $url => $ch ) {  
              
        if (curl_error ( $ch ) == '') {  
            $responses [$url] = curl_multi_getcontent ( $ch ) ;  
        }else{  
            error_log("curl error");  
        }  
        curl_multi_remove_handle ( $queue, $ch );  
        curl_close ( $ch );  
    }  
}