WordPress function Get_the_category gets detailed explanation of category information

The get_the_category function is rarely used in WordPress to obtain category information. Its function is to retrieve data related to query parameters. By utilizing this property, we can create article related items, add internal links, and improve SEO optimization results.

function prototype

The get_the_category function is located in the wp-includes/category template. php file.

function get_the_category( $id = false ) { $categories = get_the_terms( $id, ‘category’ ); if ( ! $categories || is_wp_error( $categories ) ) $categories = array(); $categories = array_values( $categories ); foreach ( array_keys( $categories ) as $key ) { _make_cat_compat( $categories[$key] ); } /** * Filters the array of categories to return for a post. * * @since 3.1.0 * @since 4.4.0 Added `$id` parameter. * * @param array $categories An array of categories to return for the post. * @param int $id ID of the post. */ return apply_filters( ‘get_the_categories’, $categories, $id ); }

You can see that the get_the_category function is related to the get_the_terms function. As for the usage of the get_the_terms function, I won’t go into detail here. It’s too remote and I rarely use it. If you need it, you can check the WordPress development manual by yourself.

parameter

get_the_category( int $id = false )

$post->ID (当前文章的编号)

注意，这个函数只能在WordPress主循环中使用！

Simple usage

Display images of categories

<?php foreach((get_the_category()) as $category) { echo ‘<img src=” http://www.2zzt.com/images/ ‘ . $category->cat_ID . ‘.jpg” alt=”‘ . $category->cat_name . ‘” />’; } ?>

Display the name of the first category

<?php $category = get_the_category(); echo $category[0]->cat_name; ?>

Display the connection of the first category

<?php $category = get_the_category(); if($category[0]){ echo ‘<a href=”‘.get_category_link($category[0]->term_id ).'”>’.$category[0]->cat_name.'</a>’; } ? >

Retrieve category information for the specified article number

<?php global $post; $categories = get_the_category($post->ID); var_dump($categories); ?>
Return the members of the object

cat_ID

Category number, stored in the term_id field

cat_name

Category name, stored in the name field

category_nicename

Alias, stored in the slug field

category_description

Category description, stored in the description field

category_parent

Parent category number, 0 for those without a parent category, stored in the parent field

category_count

The number of categories used, stored in the count field