Php Wordpress：如何以逗号分隔显示类别和子类别

如何显示子类别以逗号分隔的Wordpress类别？ 我得到了以下信息，但它不是每个子类别用逗号分隔的

我想从类别id“1”中指定所有内容，以逗号分隔显示所有子类别

$categories = get_categories();      // Current Category will retrive
foreach ( $categories as $category ) {
$cat = $category->name;              // Parent Category name
$category = get_category_by_slug( $cat );

$args = array(
'type'                     => 'post',
'child_of'                 => $category->term_id,
'orderby'                  => 'name',
'order'                    => 'ASC',
'hide_empty'               => FALSE,
'hierarchical'             => 1,
'taxonomy'                 => 'category',
); 

$child_categories = get_categories($args );

$category_list = array();
$category_list[] = $category->term_id;

if ( !empty ( $child_categories ) ){    // If child Category available
    foreach ( $child_categories as $child_category ){    // Print Child Category
        $category_list[] = $child_category->term_id;
        echo ",". $child_category->cat_name."<br/>";
    }
}
}

$categories=get_categories（）；//将检索当前类别
foreach（$categories作为$category）{
$cat=$category->name；//父类别名称
$category=通过slug（$cat）获取\u category\u；
$args=数组(
'type'=>'post'，
'child\u of'=>$category->term\u id，
'orderby'=>'name'，
“订单”=>“ASC”，
“hide_empty”=>FALSE，
“层次结构”=>1，
“分类法”=>“类别”，
); 
$child\u categories=get\u categories（$args）；
$category_list=array（）；
$category\u list[]=$category->term\u id；
if（！empty（$child_categories））{//if子类别可用
foreach（$child\u categories作为$child\u categories）{//打印子类别
$category\u list[]=$child\u category->term\u id；
echo“，”$child_category->cat_name.“
”；
}
}
}

$childCategoriesArray=Array(); // just for sake of safety

if ( !empty ( $child_categories ) ){    // If child Category available
    foreach ( $child_categories as $child_category ){    // Print Child Category
        $category_list[] = $child_category->term_id;
        $childCategoriesArray[]=$child_category->cat_name;
    }
}
}

echo implode(',',$childCategoriesArray); // that's it - comma separated :)