| $url1='http://www.91hi.net/web/demo/1.jpg' //exists$url2='http://91hi.net/web/demo/www/jd/image/logo.png'; //not 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."} |
