wp_get_post_categories

Retrieve the list of categories for a post.

Description

(array) wp_get_post_categories( (int) $post_id = 0, (array) $args = array() );

Compatibility layer for themes and plugins. Also an easy layer of abstraction away from the complexity of the taxonomy layer.

Returns (array)

List of categories. If the `$fields` argument passed via `$args` is 'all' or 'all_with_object_id', an array of WP_Term objects will be returned. If `$fields` is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.

Parameters (2)

0. $post_id — Optional. (int): The Post ID. Does not default to the ID of the global $post. Default 0.
1. $args — Optional. (array) => array(): Category arguments. See wp_get_object_terms(…). Default empty.

Usage

if ( !function_exists( 'wp_get_post_categories' ) ) { 
    require_once ABSPATH . WPINC . '/post.php'; 
} 
  
// Optional. The Post ID. Does not default to the ID of the 
// global $post. Default 0. 
$post_id = -1; 
  
// Optional. Category arguments. See wp_get_object_terms(). Default empty. 
$args = array(); 
  
// NOTICE! Understand what this does before running. 
$result = wp_get_post_categories($post_id, $args);

Defined (1)

The function is defined in the following location(s).

/wp-includes/post.php

function wp_get_post_categories( $post_id = 0, $args = array() ) { 
    $post_id = (int) $post_id; 
 
    $defaults = array('fields' => 'ids'); 
    $args = wp_parse_args( $args, $defaults ); 
 
    $cats = wp_get_object_terms($post_id, 'category', $args); 
    return $cats; 
}