查询多次给出相同的结果

Question

I'm using this code to show similar entry's to the one that's currently showing.

 $result2 = mysql_query("SELECT * FROM planten WHERE cat = '$cat' ORDER BY rand() limit 3")
 or die(mysql_error()); 
 while($row2 = mysql_fetch_array($result2)) {

  $naam_gerelateerd = $row['naam'];
  $mintemp = $row['mintemp'];    

     echo $naam_gerelateerd;

 }

Now I get 3 times the same echo.

(Lets say my current page is "Product 1", this box should show 3 similar products. But currently it echo's 3x "Product 1")

Also, how can I make my code sql-injection-protected? I've read something about PDO, but how safe is this?

Thanks in advance!

Answer 1

您的结果集在循环中将数组提取到$row2中，但您正在从$row设置$naam_gerelateerd的值，这显然是在循环外定义的。