Think enables navigation on the Microsoft official website. php unlimited multi-table queries

I developed thinkphp with a navigation solution. products and services are classified as Level 1, while environmental protection is classified as Level 2. The list of articles under Level 2 categories. I use recursive multi-dimensional arrays to loop the first-level and second-level categories in two cycles. The question now is how to obtain the second-level score...

I developed thinkphp with a navigation solution. products and services are classified as Level 1, while environmental protection is classified as Level 2. The list of articles under Level 2 categories.
I use recursive multi-dimensional arrays to loop the first-level and second-level categories in two cycles. The question now is how to obtain the list of articles under the secondary classification?

  
   
Use Admin \ Model \ Category; $ cate = M ('cate')-> order ('sort ')-> select (); import ("Admin. model. category "); $ cate = Category: unlimitedForLayer ($ cate); // multi-dimensional array read infinitus Category
                  
  
  
  
   
{$ V. name}  
 
 
 
 
  {$ Value. name} 
 
    
 
     
Article list
 
    
 
 
  
  
  
  

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I developed thinkphp with a navigation solution. products and services are classified as Level 1, while environmental protection is classified as Level 2. The list of articles under Level 2 categories.
I use recursive multi-dimensional arrays to loop the first-level and second-level categories in two cycles. The question now is how to obtain the list of articles under the secondary classification?

  
   
Use Admin \ Model \ Category; $ cate = M ('cate')-> order ('sort ')-> select (); import ("Admin. model. category "); $ cate = Category: unlimitedForLayer ($ cate); // multi-dimensional array read infinitus Category
                  
  
  
  
   
{$ V. name}  
 
 
 
 
  {$ Value. name} 
 
    
 
     
Article list
 
    
 
 
  
  
  
  

In php, query the corresponding article data based on the List ID again!