Store products that appear in a php file in a .scv or a .txt separated by commas

Good morning I am doing a virtual store with php without databases and I have a problem. As you can see, I have a table with the products. Since there is no database, I have to store this data in a file as an array and I do not know how to do it. Attached code. I also use sessions in this case I am in session and that aspect does not matter. Thank you


    

    
        
        
        
        
        
        
        Accés to sessió com a javi
    
    
        
        
        
        <? php
// session_start ();
$ value = $ _SESSION['acces'];
if ($ _SESSION['acces']! = "2") {
// echo "No s'ha iniciat correctament aquesta sessió";
echo "No heu accedit correctament";
print '';
} else {
// echo "Value of the session: $ value
 n ";
// echo "Benvingut to the private page

 n ";
//threw out "Surt of sessió n ";
?>
            
XiaomisiOsi virtual store

            

            
                
                XiaomiManda's virtual store
            

            
                

                

                    

                        

                            Product image
                            First name
                            Price
                            Total units
                            Buy unit
                        

                        

                            
                            Xiaomi
                            100
                            10
                            Yes
                       
                        

                            
                            Xiaomimi8
                            200
                            10
                            Yes
   
                        

                        

                            
                            Xiaomimix2
                            300
                            10
                            Yes
   
                            

                    

                    
                

            
            
            Access cart
            


            

            
Surt of sessió