Detailed introduction to the function and usage of get_headers function in php_PHP tutorial

get_headers() is a PHP system-level function that returns an array containing the headers sent by the server in response to an HTTP request. If it fails, it returns FALSE and issues an E_WARNING level error message (which can be used to determine whether the remote file exists).

Function definition

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

Parameters

url target URL

format If the optional format parameter is set to 1, get_headers() will parse the corresponding information and set the key name of the array.

Example

$url='http://www.phpernote.com';
print_r(get_headers($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
)

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