The function get_headers in php and its usage are introduced in detail

get_headers() is an PHP system-level function that returns an array of headers sent by the server in response to an HTTP request. If it fails, FALSE is returned and an E_WARNING level error message is sent (to determine if the remote file exists).

The function definitions

array get_headers ( string $url [, int $format = 0 ] )

parameter

url target URL

If format sets the optional format parameter to 1, get_headers() parses the information and sets the array's key name.

The sample

< ?php
$url='http://www.phpernote.com';
print_r(get_headers($url));
print_r(get_headers($url,1));
? >

The output of the above routine is similar to:

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
)