February 12, 2011 
Definition:
function wp_kses_decode_entities($string) {}
Convert all entities to their character counterparts.
This function decodes numeric HTML entities (A and A). It doesn’t do anything with other entities like ä, but we don’t need them in the URL protocol whitelisting system anyway.
Parameters
- string $string: Content to change entities
Return values
returns:Content after decoded entities
Source code
function wp_kses_decode_entities($string) {
$string = preg_replace_callback('/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string);
$string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string);
return $string;
}
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A HitchHackers guide through WordPress 
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