php - Disable "Add to Cart" button if the user already purchased that item from the Database -


i have been working on issue past couple days , it's been driving me nuts, thought bring question @ hand here. please note still learning php :) practice project.

i creating mockup registration page users of registration page can signup, purchase items, , see others purchased item (this intentional). current issue want disable user purchasing item purchased disabling "add cart" button if item user exists in database already. basically, buyer can purchase 1 item database , when try purchase 1 going store, "add cart" button disabled them.

note: when made (about 2 months ago) using mysql learning mysqli started (very slowly) converting it. database file has both connections mysql , mysqli it, allowed me utilize both @ same time learned , went along. 

<?php session_start(); // starts session carry variables include_once('this sql file goes. removed it'); //connects page database  /* verifies user logged in, if not redirect them index.php */ if($loggedin != 1) {     header("location: index.php"); }  /* category feature. allows page sorted sort column */ if (isset($_post['searchcatbtn'])){   }  include("header.php") /* includes header */ ?>  <!doctype html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>shopping cart</title> <link href="style/style.css" rel="stylesheet" type="text/css"> </head> <body>  <!-- creates products within div provided style sheet--> <div id="products-wrapper"> <h1>products</h1> <div class="products">      <?php     //current url of page. cart_update.php redirects url     $current_url = base64_encode($url="http://".$_server['http_host'].$_server['request_uri']);      $qcategories = mysql_query("select distinct sort events order sort asc;");//get data users table sorts list alphabetically username     $results = $mysqli->query("select * events order eventid");// sort = '$sort'      $remaining = $mysqli->query("select * orders");     $obj_r = $remaining->fetch_object(); // obj_r means objects remaining     $category = $obj->sort;       if ($results) {           //fetch results set object , output html         while($obj = $results->fetch_object())         {             echo '<div class="product">';              echo '<form method="post" action="cart_update.php">';             echo '<div class="product-thumb"><img src="images/'.$obj->image.'"></div>';             echo '<div class="product-content"><h4>'.$obj->name.'</h4>';             echo '<div class="product-desc">'.$obj->description.'</div>';             echo '<div class="product-info">';             echo 'price: '.$currency.$obj->price.' | ';             echo 'items left: '.$obj->max.' | ';             echo '<input type="hidden" style="width:20px;height:15px;" type="text" name="product_qty" value="1" size="3" />'; // old code display qty box: qty: <input style="width:20px;height:15px;" type="text" name="product_qty" value="1" size="3" />';             echo '<button class="add_to_cart">add cart</button>';             echo '</div></div>';             echo '<input type="hidden" name="product_code" value="'.$obj->name.'" />';             echo '<input type="hidden" name="type" value="add" />';             echo '<input type="hidden" name="return_url" value="'.$current_url.'" />';             echo '</form>';             echo '</div>';         }      }     ?>  </div>   <!-- creates cart within div provided style sheet--> <div class="shopping-cart"> <h2>your shopping cart</h2>     <?php     if(isset($_session["products"]))         {         $total = 0; //sets default vaule of total         echo '<ol>';         foreach ($_session["products"] $cart_itm) /* calls session , references cart_itm. creates items in cart per item. if empty, shows empty cart*/             {                 echo '<li class="cart-itm">';                 echo '<span class="remove-itm"><a href="cart_update.php?removep='.$cart_itm["code"].'&return_url='.$current_url.'">&times;</a></span>';                 echo '<h3>'.$cart_itm["name"].'</h3>';                 echo '<div class="p-code">product code : '.$cart_itm["code"].'</div>'; //safe delete if want                 echo '<div class="p-qty">qty : '.$cart_itm["qty"].'</div>';                 echo '<div class="p-price">price :'.$currency.$cart_itm["price"].'</div>';                 echo '</li>';                 $subtotal = ($cart_itm["price"]*$cart_itm["qty"]);                 $total = ($total + $subtotal);             }           echo '</ol>';         echo '<span class="check-out-txt"><strong>total : '.$currency.$total.'</strong> <a href="view_cart.php">check-out!</a></span>'; /* total amount of cart */         echo '<span class="empty-cart"><a href="cart_update.php?emptycart=1&return_url='.$current_url.'">empty cart</a></span>';         }     else         {             echo 'your cart empty';         }     ?> <br><br>      <!-- creates categories. allows page sorted category --> <h2>categories</h2> <form name="searchcat" action="store.php" method="post"> <div align="center"> <select name="mydropdown">  <?php                while($row = mysql_fetch_array($qcategories))//loops through $query row row     {         echo '<option value="' . $row['sort'] . '">' . $row['sort'] . '</option>'; //prints categories looping though array     }                ?>   <input type="submit" name="searchcatbtn" class="btn btn-success" value="submit edits" />     </form> </select> </div> </div>  </body>  </html>


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