PHP URLs

The URL extension is to deal with URL strings: encoding, decoding, and parsing, etc.

Example to encode an URL into base64

<?php

$str = 'This is an encoded string';
echo base64_encode($str);

?>

Output

Example to decode base64 string into a normal string

<?php

$str = 'VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==';
echo base64_decode($str);

?>

Output

Requirements

No external libraries are needed to build this extension.

Installation

There is no installation needed to use these functions; they are part of the PHP core.

Run-time Configuration

This extension has no configuration directives defined in php.ini.

Resource Types

This extension has no resource types defined.

Predefined Constants

This extension provided some predefined constants:

• PHP_URL_SCHEME - (integer)
• PHP_URL_HOST - (integer)
  • Outputs the hostname of the URL parsing.
• PHP_URL_PORT - (integer)
  • Outputs the port of the URL parsed.
• PHP_URL_USER - (integer)
  • Outputs the user of the URL parsing.
• PHP_URL_PASS - (integer)
  • Outputs the password of the URL parsed.
• PHP_URL_PATH - (integer)
  • Outputs the path of the URL parsing.
• PHP_URL_QUERY - (integer)
  • Outputs the query string of the URL parsed.
• PHP_URL_FRAGMENT - (integer)
  • Outputs the fragment (the string after the hashmark #) of the URL parsed.
  • The following constants are meant to be used with http_build_query().
• PHP_QUERY_RFC1738 - (integer)
  • Encoding is performed per » RFC 1738 and the application/x-www-form-urlencoded media type,
  • which implies that spaces are encoded as plus (+) signs.
• PHP_QUERY_RFC3986 - (integer)
  • Encoding is performed according to » RFC 3986, and spaces will be percent-encoded (%20).

URLs functions

• base64_decode — Decodes data encoded with MIME base64
• base64_encode — Encodes data with MIME base64
• get_headers — Fetches all the headers sent by the server in response to an HTTP request
• get_meta_tags — Extracts all meta tag content attributes from a file and returns an array
• http_build_query — Generate URL-encoded query string
• parse_url — Parse a URL and return its components
• rawurldecode — Decode URL-encoded strings
• rawurlencode — URL-encode according to RFC 3986
• urldecode — Decodes URL-encoded string
• urlencode — URL-encodes string