URL encoder according to RFC 3986

urlencoder_rfc3986.php

/**
 * URL encoder according to RFC 3986
 * Returns a string containing the encoded URL with disallowed characters converted to their percentage encodings.
 * @link http://publicmind.in/blog/url-encoding/
 *
 * @param $url
 * @return string
 */
function encode_url($url)
{
	$reserved = array(
		":" => '!%3A!ui',
		"/" => '!%2F!ui',
		"?" => '!%3F!ui',
		"#" => '!%23!ui',
		"[" => '!%5B!ui',
		"]" => '!%5D!ui',
		"@" => '!%40!ui',
		"!" => '!%21!ui',
		"$" => '!%24!ui',
		"&" => '!%26!ui',
		"'" => '!%27!ui',
		"(" => '!%28!ui',
		")" => '!%29!ui',
		"*" => '!%2A!ui',
		"+" => '!%2B!ui',
		"," => '!%2C!ui',
		";" => '!%3B!ui',
		"=" => '!%3D!ui',
		"%" => '!%25!ui',
	);

	$url = rawurlencode($url);
	$url = preg_replace(array_values($reserved), array_keys($reserved), $url);
	return $url;
}