A detailed introduction to the function and usage of get_headers functions in PHP _php example

Get_headers () is a PHP system-level function that returns an array containing the headers that the server responds to an HTTP request. Returns False if it fails and emits a e_warning-level error message that can be used to determine whether a remote file exists.

function definition

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

Parameters

URL Destination URL

Format if you set the optional format parameter to 1, Get_headers () parses the appropriate information and sets the key name of the array.

Example

<?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 the following:

Array
(
    [0] => http/1.1 OK
    [1] => Date: Sat, May 12:28:13 GMT
    [2] => server:apache/1.3.27 (Unix)   (red-hat/linux)
  ;   [3] => last-modified:wed, 2003 23:11:55 GMT
    [4] => ETag: "3f80f-1b6-3e1c b03b "
    [5] => accept-ranges:bytes
    [6] => content-length:438
    [7] => connection:close
    [8] => content-type:text/html

Array
(
[0] => http/1.1 OK
[Date] => Sat, May 12:28:14 GMT
[Server] => apache/1.3.27 (Unix) (Red-hat/linux)
[Last-modified] => Wed, 2003 23:11:55 GMT
[ETag] => "3f80f-1b6-3e1cb03b"
[Accept-ranges] => bytes
[Content-length] => 438
[Connection] => Close
[Content-type] => text/html
)