Selecting Item From Category id - php

Question

I'm trying to select items for my different category table but its shows only the i use with If() and I'm trying to use elseif
if($get_idy='Cars'){
$sel = mysqli_query($con,"SELECT * FROM item WHERE category='Cars' ");
}elseif($get_idy='Trucks'){
$sel = mysqli_query($con,"SELECT * FROM item WHERE category='Trucks' ");
}
while($row= mysqli_fetch_array($sel))
{
Can someone help?

Answer 1

You have put wrong if condition in your code.Single "=" assign the value in variable and double "==" check variable value is same or not. It should be like below.
if($get_idy=='Cars'){
$sel = mysqli_query($con,"SELECT * FROM item WHERE category='Cars' ");
} elseif($get_idy=='Trucks'){
$sel = mysqli_query($con,"SELECT * FROM item WHERE category='Trucks' ");
} else{
echo "The category is empty";
}
while($row= mysqli_fetch_array($sel))
{
}

Answer 2

You could have done like this instead checking condition for every category,
$sel = mysqli_query($con,"SELECT * FROM item WHERE category='".$get_idy."'");
while($row= mysqli_fetch_array($sel)) {
//Your code here.
}
Please start using PDO as your sql is vulnerable to SQL Injections
Update: posted this update based on your comment
if(isset($get_idy)) {
$sel = mysqli_query($con,"SELECT * FROM item WHERE category='".$get_idy."'");
while($row= mysqli_fetch_array($sel)) {
//Your code here.
}
} else {
echo "The category is empty";
}