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in_category › WordPress Function

Since1.2.0

Deprecatedn/a

› in_category ( $category, $post = null )

Parameters: (2)	(int\|string\|int[]\|string[]) $category Category ID, name, slug, or array of such to check against. Required: Yes (int\|WP_Post) $post Optional. Post to check. Defaults to the current post. Required: No Default: null
Returns:	(bool) True if the current post is in any of the given categories.
Defined at:	wp-includes/category-template.php , line 257
Codex:	developer.wordpress.org / in_category
Change Log:	2.7.0

Checks if the current post is 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. Prior to v2.5 of WordPress, category names were not supported. Prior to v2.7, category slugs were not supported. Prior to v2.7, only one category could be compared: in_category( $single_category ). Prior to v2.7, this function could only be used in the WordPress Loop. As of 2.7, the function can be used anywhere if it is provided a post ID or post object. For more information on this and similar theme functions, check out the {@link Conditional Tags} article in the Theme Developer Handbook.

Source

function in_category( $category, $post = null ) {
	if ( empty( $category ) ) {
		return false;
	}

	return has_category( $category, $post );
}