標籤:php header 回頭部資訊
<?php$url1=‘ //not exists $url2=‘ //exists $get1=get_headers($url1);$get2=get_headers($url2);print_r($get1);print_r($get2);
返回結果:
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狀態資訊組成的一維數組.且第一個數組單元為響應狀態資訊.
於是乎,通過擷取到的狀態代碼,用來判斷遠端資源是否存在。
$statusCode=substr($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” 部落格,請務必保留此出處http://phpme.blog.51cto.com/663593/1906497
php請求遠程檔案之返回頭部資訊 get_headers()