Decodes special character entities that appear in HTML literal strings.
HTML_DECODE ( string )
string An arbitrary literal string used in an HTML document.
This function returns the string argument after making the following set of substitutions:
| Characters | Substitution | 
|---|---|
| " | " | 
| ' | ' | 
| & | & | 
| < | < | 
| > | > | 
| &#xnn; | character nn |