Introduction to URL Functions in PHP and examples of using example _php

base64_encode-encoding data using MIME base64
Base64_encode () returns uses Base64 to encode data. This encoding is designed so that binary data can be transmitted through a non-pure 8-bit transport layer, such as the body of an e-mail message.
base64-encoded data takes up about 33% more space than the original data.

Copy the Code code as follows:
$str = ' This was an encoded string ';
vghpcybpcybhbiblbmnvzgvkihn0cmluzw==
echo Base64_encode ($STR);
?>

base64_decode-decoding data encoded with MIME base64
Base64_decode () Decodes the Encoded_data, returns the original data, and returns FALSE if it fails. The returned data may be binary.

Copy the Code code as follows:
$str = ' vghpcybpcybhbiblbmnvzgvkihn0cmluzw== ';
This is an encoded string
echo Base64_decode ($STR);
?>

get_headers-get the server to respond to all headers sent by an HTTP request
Get_headers () returns an array that contains the headers sent by the server in response to an HTTP request. If it fails, it returns false and emits an e_warning level error message.
If the optional format parameter is set to 1, Get_headers () parses the corresponding information and sets the array's key name.

The

copy Code code is as follows:
!--? php $phpha 1 = get_headers (' http://www.php.net ');
$phpha 2 = get_headers (' http://www.php.net ', 1);
Print_r ($phpha 1);
Print_r ($phpha 2);
?

The

Output is as follows:
Copy the code code as follows:
Array
(
[0] = = http/1.1 OK
[1] = server:nginx/1.2.2
[2] = Date:tue, 10:17:59 GMT
[3] = content-type:text/html; Charset=utf-8
[4] = Conn Ection:close
[5] = x-powered-by:php/5.3.8
[6] = x-pingback:http://www.php.net/xmlrpc.php
[7] = = via:10.67.15.26
[8] = set-cookie:saeut=124.127.138.35.1352197078737175; path=/; max-age=311040000
)
Array
(
[0] = http/1.1 + OK
[Server] = nginx/1.2.2
[Date] = Tue, Nov 10:17:59 GMT
[Content-type] = text/html; Charset=utf-8
[Connection] = Close
[x-powered-by] = php/5.3.8
[X-pingback] = http://www.php.net /xmlrpc.php
[Via] = 10.67.15.21
[Set-cookie] = saeut=124.127.138.35.1352197079055460; path=/; max-age= 311040000
)

get_meta_tags-extracts all meta tags from a file content property, returns an array
As you can imagine, some websites can easily use this function for website SEO information extraction.

Copy the Code code as follows:
Tianya PHP Blog Http://www.php.net
$phpha = get_meta_tags (' http://www.php.net ');
Print_r ($phpha);
?>

The output is as follows:
Copy the Code code as follows:
Array
(
[keywords] = Tianya blog, PHP blog, PHP technology blog, PHP Learning blog, PHP development Blog
[description] + tianya PHP blog is a PHP-based learning blog, record Phper learning process, pay attention to the latest developments in the Internet.
[Generator] = WordPress 3.2.1
)

http_build_query-the request string after generating Url-encode

$url = Array (' c ' = = ' blog ', ' a ' = ' show ', ' id ' =>10, ' hello ', ' world ');
C=blog&a=show&id=10&0=hello&1=world
echo Http_build_query ($url);
C=blog&a=show&id=10&phpha_0=hello&phpha_1=world
Echo http_build_query ($url, ' php_ ');
?>
[/code]

This function I used most of the place is to make a variety of APIs, the combination of request URL, very convenient.
You can also see that you can specify a prefix for the members of the numeric index within the array.

parse_url-parse URL, return its components
This function parses a URL and returns an associative array containing the various components that appear in the URL. This function is not used to validate the legitimacy of a given URL, but to decompose it into the parts listed below. An incomplete URL is also accepted, and Parse_url () tries to parse it as correctly as possible.

Copy the Code code as follows:
$url = ' Http://tianya:php.net@php.com/hello.php?id=10#nav ';
Print_r (Parse_url ($url));
?>
Array
(
[Scheme] = http
[Host] = phpha.com
[User] = Tianya
[Pass] = phphadotcom
[Path] =/hello.php
[Query] = id=10
[Fragment] = Nav
)

rawurlencode-encoding URLs according to RFC 1738
rawurldecode-decoding encoded URL strings
urlencode-encoded URL string
urldecode-decoding encoded URL strings

Copy the Code code as follows:
$url = ' http://www.php.net Tianya ';
echo UrlEncode ($url);
Echo '
';
echo Rawurlencode ($url);
Echo '
';
echo UrlDecode ($url);
Echo '
';
echo Rawurldecode ($url);
?>

The output is as follows:
Copy the Code code as follows:
Http%3a%2f%2fwww.php.net+tianya
Http%3a%2f%2fwww.php.net%20tianya

As you can see, the difference between UrlEncode and Rawurlencode is:
UrlEncode () encodes the space as a plus sign (+), and Rawurlencode () encodes the space as%20
UrlDecode () and Rawurldecode () are the corresponding decoding functions.

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