February 12, 2011 
Definition:
function in_category( $category, $post = null ) {}
Check if the current post in within any of the given categories.
The given categories are checked against the post’s categories’ term_ids, names and slugs. Categories given as integers will only be checked against the post’s categories’ term_ids.
Parameters
- int|string|array $category: Category ID, name or slug, or array of said.
- int|object $_post: Optional. Post to check instead of the current post. (since 2.7.0)
- $post
Return values
returns:True if the current post is in any of the given categories.
Source code
function in_category( $category, $post = null ) {
if ( empty( $category ) )
return false;
return has_term( $category, 'category', $post );
}
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