<?php $url1=‘ //not exists $url2=‘ //exists $get1=get_headers($url1); $get2=get_headers($url2); print_r($get1); print_r($get2);
返回结果:
Array ( [0] => HTTP/1.1 404 Not Found [1] => Date: Tue, 14 Mar 2017 10:58:00 GMT [2] => Server: Apache [3] => Vary: User-Agent,Accept-Encoding [4] => Connection: close [5] => Content-Type: text/html ) Array ( [0] => HTTP/1.1 200 OK [1] => Date: Tue, 14 Mar 2017 10:58:00 GMT [2] => Server: Apache [3] => Last-Modified: Wed, 09 Nov 2016 08:57:06 GMT [4] => ETag: "2162a05-13f5-540da70f97c80" [5] => Accept-Ranges: bytes [6] => Content-Length: 5109 [7] => Vary: User-Agent [8] => Connection: close [9] => Content-Type: image/png ) 可以看到返回的http状态信息组成的一维数组.且第一个数组单元为响应状态信息.
于是乎,通过获取到的状态码,用来判断远程资源是否存在。
$statusCode=substr($get1[0], 9, 3); if($statusCode == 200 || $statusCode == 304){ echo "It‘s exists." }else{ echo "It‘s not exists." }
本文出自 “我的PHP之路” 博客,请务必保留此出处http://phpme.blog.51cto.com/663593/1906497
php请求远程文件之返回头部信息 get_headers()
原文地址:http://phpme.blog.51cto.com/663593/1906497