我试图直接从phpmyadmin获取类别，但我做不到。然后我尝试在public\\u html中创建这个php脚本

include "wp-includes/category-template.php";

$args = array(
    \'hide_empty\' => 0,
    \'pad_counts\' => true
);
$categories = get_categories( $args );
foreach($categories as $category) {

    if($category->count == 0) {
        echo $category->name."<br />";
    } else {
        // do nothing
    }

}
?>

但它返回了一个致命错误：在/mnt/env/****/development/public\\u html/test中调用未定义的函数get\\u categories（）。php第9行