get_the_category( int $post_id = false )

使用示例

• 示例1

  仅显示第一个类别名称

  $categories = get_the_category();
  
  if ( ! empty( $categories ) ) {
  	echo esc_html( $categories[0]->name );	
  }
  

  （回显$categories的第一个数组元素（[0]）。）

  将第一个类别链接到类别页面：

  $categories = get_the_category();
  if ( ! empty( $categories ) ) {
  	echo '<a href="' . esc_url( get_category_link( $categories[0]->term_id ) ) . '">' . esc_html( $categories[0]->name ) . '</a>';
  }
  

• 示例2

  函数响应示例：

  $categories = get_the_category();
  
  var_dump($categories);

  array(1) {
  [0]=>
    object(stdClass)#310 (17) {
      ["term_id"]=>
      &int(6)
      ["name"]=>
      &string(10) "familylife"
      ["slug"]=>
      &string(10) "familylife"
      ["term_group"]=>
      int(0)
      ["term_taxonomy_id"]=>
      int(6)
      ["taxonomy"]=>
      string(8) "category"
      ["description"]=>
      &string(0) ""
      ["parent"]=>
      &int(0)
      ["count"]=>
      &int(208)
      ["object_id"]=>
      int(7729)
      ["filter"]=>
      string(3) "raw"
      ["cat_ID"]=>
      &int(6)
      ["category_count"]=>
      &int(208)
      ["category_description"]=>
      &string(0) ""
      ["cat_name"]=>
      &string(10) "familylife"
      ["category_nicename"]=>
      &string(10) "familylife"
      ["category_parent"]=>
      &int(0)
    }
  }

• 示例3

  如果您有自定义的post_type，请获取post类别

  <?php
  /* FIRST
   * Note: This function only returns results from the default “category” taxonomy. For custom taxonomies use get_the_terms().
   */
  $categories = get_the_terms( $post->ID, 'taxonomy' );
  // now you can view your category in array:
  // using var_dump( $categories );
  // or you can take all with foreach:
  foreach( $categories as $category ) {
      echo $category->term_id . ', ' . $category->slug . ', ' . $category->name . '<br />';
  }
  

• 示例4

  将所有类别显示为链接这会将分配给文章的所有类别输出为链接。必须在循环内使用。您也可以为此使用函数get_the_category_list()。

  $categories = get_the_category();
  $separator = ' ';
  $output = '';
  if ( ! empty( $categories ) ) {
  	foreach( $categories as $category ) {
  		$output .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" alt="' . esc_attr( sprintf( __( 'View all posts in %s', 'textdomain' ), $category->name ) ) . '">' . esc_html( $category->name ) . '</a>' . $separator;
  	}
  	echo trim( $output, $separator );
  }
  

• 示例5

  从循环外获取文章类别

  <?php
  $post = get_post();
  if ( $post ) {
  	$categories = get_the_category( $post->ID );
  	var_dump( $categories );
  }
  

• 示例6

  显示包含名称和说明的所有类别

  <div>
  <?php 
  	foreach((get_the_category()) as $category){
  		echo $category->name."<br>";
  		echo category_description($category);
  		}
  	?>
  </div>
  

• 示例7

  要显示与文章相关的类别列表（用逗号分隔），请编写以下代码：

  $cats = array();
foreach (get_the_category($post_id) as $c) {
$cat = get_category($c);
array_push($cats, $cat->name);
}

  if (sizeOf($cats) > 0) {
$post_categories = implode(', ', $cats);
} else {
$post_categories = 'Not Assigned';
}

  echo $post_categories;

• 示例8

  用逗号显示类别列表

  <?php
  $categories = get_the_category();
  $category_list = join( ', ', wp_list_pluck( $categories, 'name' ) );
  
  echo wp_kses_post( $category_list );
  

• 示例9

  显示类别图像这将输出以cat_ID命名的类别图像，alt属性设置为cat_name。也可以使用任何其他成员变量。

  <?php
  $categories = get_the_category();
  foreach ( $categories as $category ) { 
  	echo '<img src="' . esc_url( 'http://example.com/images/' . intval( $category->term_id ) . '.jpg' ) . '" alt="' . esc_attr( $category->name ) . '" />'; 
  }