mysql - Trouble retrieving products under a complex category structure in PHP -

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I hope you guys can help me with this one. Therefore, I have a product table and a category table. The structure for the table of categories is listed bellow. With a series of three or four levels, there would be about 20 categories, a recurring event was written to get the class tree and it is working fine.

My new job is to show products for a given category. As an example, I will show the data in the beta. Therefore, if I add a product with category_id = 7, then I have to show that product when the user selects Category 7, but when the user also chooses Category 4 or Category 1. In addition, if a user selects the category with ID = 1, the products for Category = 1, 4, 5, 6 are to be displayed.

My categories table this looks as follows: 

  Create tab 'categories' ( `Sreni_aidi`) (5) unsigned NOT NULL Autisiaartiment,` Kategri_nam` considered (256) character set Utif 8 Collet Utif 8_inikod_si not, `Sreni_slog` considered (256) character set UTF-8 Collet Utif 8_inikod_si not,` Sreni_parnt` small (5) unsigned nOT nULL default '0', `category_description_ro` text reader sET utf8 COLLATE utf8_unicode_ci tap , `Range_description_en Si` text reader option is an example of data in utf8 COLLATE utf8_unicode_ci tap, PRIMARY KEY ( `Sreni_aidi`)) engine = Maisam AUTO_INCREMENT = 8 DEFAULT CHARSET = latin1

Bellow table: 

  category id | Category name | Category_parent 1 categoria 1 0 2 categoria 2 0 3 categoria 3 0 4 categoria 1.1 1 5 categoria 1.2 1 6 1.3 Category 1 Category 7 1.1.2 4  
 "Post-text" Aitmprop = "text"> < P> In similar cases, I have created a recursive function which will allow me to get all the children in a category, and also the category itself.

SQL

then you can simply say 

  in WHERE category (cat1, cat2, .. update.)   
 If you find a function that you want children, which adds to the yield, 1 results [1,4,5,6,7]  
 Then your query  
  WHERE category (1,4,5,6,7)  
 
 is a short way to write 
 
  WHERE category = 1 or category = 4 or category = 5 ...  
 
 So this is actually a statement that will be able to get the products, though The same category ID is attached

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