simple urlencode and urldecode in php

urlencode()
it returns the URL encoded version of the given string. URL coding converts special characters into % signs followed by two hex digits. For example: urlencode(”10.00%”) will return “10%2E00%25″.
URL encoded strings are safe to be used as part of URLs.

urldecode()
it returns the URL decoded version of the given string.Anwser 2:
string urlencode(str) – Returns the URL encoded version of the input string. String values to be used in URL query string need to be URL encoded. In the URL encoded version:

Alphanumeric characters are maintained as is.
Space characters are converted to “+” characters.
Other non-alphanumeric characters are converted “%” followed by two hex digits representing the converted character.
string urldecode(str) – Returns the original string of the input URL encoded string.For example:
$discount =”20.00%”;
$url = “http://domains.com/submits.php?discs=”.urlencode($discount);
echo $url;You will get “http://domains.com/submits.php?discs=20%2E00%25″