|   | ![[ Previous ]](navbprev.gif)  ![[ Contents ]](navbhome.gif)  ![[ Index ]](navbhelp.gif)  ![[ Next ]](navbnext.gif)  | 
This function encodes all the characters in data except the alphanumerics. The encoding for a character is a "%" followed by the two-character hexadecimal representation for the character. This encoding is defined in RFC1738, Uniform Resource Locators (URL).