php里常用的远程采集函数

/** 
 * 获取远程url的内容 
 * @param string $url 
 * @return string 
 */
function get_url_content($url) { 
  if(function_exists(curl_init)) { 
    $ch = curl_init(); 
    $timeout = 5; 
    curl_setopt ($ch, CURLOPT_URL, $url); 
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout); 
    curl_setopt ($ch, CURLOPT_TIMEOUT, $timeout); 
      
    $file_cOntents= curl_exec($ch); 
    curl_close($ch); 
  } else { 
    $file_cOntents= file_get_contents($url); 
  } 
  
  return $file_contents; 
}

测试

$url = 'http://www.baidu.com'; 
$a = get_url_content($url); 
echo $a;