Web Standards Programmer's Reference: HTML, CSS, JavaScript®, Perl, Python®, and PHP

F.38. URL

Function	Returns	Description
http_build_query(mixed formdata [, string prefix])	string	Generates a form-encoded query string from an associative array or object.
parse_url(string url)	array	Parses a URLand returns its components.
get_headers(string url)	array	Fetches all the headers sent by the server in response to an HTTP request.
urlencode(string str)	string	URL-encodes all non alphanumeric characters except -_.
urldecode(string str)	string	Decodes URL-encoded string.
rawurlencode(string str)	string	URL-encodes all non alphanumeric characters.
rawurldecode(string str)	string	Decodes URL-encoded string.
base64_encode(string str)	string	Encodes string using MIME base64 algorithm.
base64_decode(string str)	string	Decodes string using MIME base64 algorithm.
get_meta_tags(string filename [, bool use_include_path])	array	Extracts all meta tag content attributes from a file and returns an array.