求指点PHP里的curl_exec有关问题

<?php<br />$url = '某个连接地址url.rar格式';<br />$ch = curl_init(); //初始化<br />curl_setopt($ch, CURLOPT_URL, $url); //你要访问的页面<br />curl_setopt($ch, CURLOPT_REFERER, '某个来路url'); //伪造来路页面<br />curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); <br /><br />$content = curl_exec($ch); //执行<br />curl_close($ch); //关闭<br />echo $content;<br />?>

$url = '/某个连接地址url.rar格式';<br />$ch = curl_init(); //初始化<br />curl_setopt($ch, CURLOPT_URL, $url); //你要访问的页面<br />curl_setopt($ch, CURLOPT_REFERER, '某个来路url'); //伪造来路页面<br />curl_setopt($ch, CURLOPT_HEADER, 1); //要读回 http 头<br />curl_setopt($ch, CURLOPT_WRITEFUNCTION, 'func'); //监听返回的数据<br />curl_exec($ch); //执行<br /><br />function func($ch, $str) {<br />  static $s = '@';<br />  if($s) {<br />    $s = trim($str);<br />    if($s) header($s); //如果是头信息，则发送相应的头<br />  }else echo $str; //否则发送数据<br />  return strlen($str);<br />}<br />