get_headers() 是PHP系统级函数，他返回一个包含有服务器响应一个 HTTP 请求所发送的标头的数组。如果失败则返回 FALSE 并发出一条 E_WARNING 级别的错误信息(可用来判断远程文件是否存在)。
函数定义
参数
url 目标 URL
示例
PHP
$url='http://www.PHPernote.com';
print_r(get_headers($url));
print_r(get_headers($url,1));
?>
以上例程的输出类似于：
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
) 原文链接：https://www.f2er.com/php/26635.html
