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in_category ›

Since1.2.0
Deprecatedn/a
in_category ( $category, $post = null )
Parameters: (2)
  • (int|string|array) $category Category ID, name or slug, or array of said.
    Required: Yes
  • (int|object) $post Optional. Post to check instead of the current post. (since 2.7.0)
    Required: No
    Default: null
Returns:
  • (bool) True if the current post is in any of the given categories.
Defined at:
Codex:

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 https://developer.wordpress.org/themes/basics/conditional-tags/ 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 );
}