Checks if the current post is within any of the given categories.

Description

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 Conditional Tags article in the Theme Developer Handbook.

Parameters

$categoryint|string|int[]|string[]required

Category ID, name, slug, or array of such to check against.

$postint|WP_Postoptional

Post to check. Defaults to the current post.

Default:null

Return

Source

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

	return has_category( $category, $post );
}

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Changelog