<?php
/* php使用curl判断404
 * Created on 2016-6-24
 * Writer www.youkud.com
 */
 function chkurl($url){
    $handle = curl_init($url);
    curl_setopt($handle, CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 10);//设置超时时间
    curl_exec($handle);
    //检查是否404（网页找不到）
    $httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
    if($httpCode == 404) {
      return false;
    }else{
        return true;
    }
    curl_close($handle);
 }
 $url="http://www.youkud.com/asdasd.html";
 if(chkurl($url)==true){
     echo "存在";
 }else{
     echo "不存在";
 }
?>

运行结果为：不存在