php 判断远程图片是否有效
?
$url = "http://www.iteye.com/upload/logo/user/275746/46a4c886-427e-3554-b195-083430beb92a.jpg"; echo "<a href='$url'>$url</a><br/>"; $arr = get_headers($url,1); echo $arr["Content-Type"]; //image/jpeg
以下是手册上的:
get_headers() 返回一个数组，包含有服务器响应一个 HTTP 请求所发送的标头。如果失败则返回 FALSE 并发出一条 E_WARNING 级别的错误信息。
如果将可选的 format 参数设为 1，则 get_headers() 会解析相应的信息并设定数组的键名。
??
$url = 'http://www.example.com';print_r(get_headers($url));print_r(get_headers($url, 1));?> 上例的输出类似于：Array( [0] => HTTP/1.1 200 OK [1] => Date: Sat, 29 May 2004 12:28:13 GMT [2] => Server: Apache/1.3.27 (Unix) (Red-Hat/Linux) [3] => Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT [4] => ETag: "3f80f-1b6-3e1cb03b" [5] => Accept-Ranges: bytes [6] => Content-Length: 438 [7] => Connection: close [8] => Content-Type: text/html)Array( [0] => HTTP/1.1 200 OK [Date] => Sat, 29 May 2004 12:28:14 GMT [Server] => Apache/1.3.27 (Unix) (Red-Hat/Linux) [Last-Modified] => Wed, 08 Jan 2003 23:11:55 GMT [ETag] => "3f80f-1b6-3e1cb03b" [Accept-Ranges] => bytes [Content-Length] => 438 [Connection] => close [Content-Type] => text/html)
