comparing php array in while loop

Question

I'm trying to get this while loop to compare the users selection in $brandSel which is assigned via a combobox

to an array value $phoneBrand which is assigned from reading out a text file. But it does not seem to be working.

$brandSel = $_POST["brand"];

//check if user has selected All or a specific brand display selections accordingly

if($brandSel == "All" OR $brandSel == $phoneBrand[$i]){

while($i < sizeof($phoneBrand)){

$i++;

echo "<tr><td></td><td>".$phoneBrand[$i]."</td><td>".$phoneModel[$i]."</td><td>".$phonePrice[$i]."</td></tr>";

}

}

Answer 1

There are a few issues with the code provided. First, the variable $i is not initialized before the while loop, so it should be initialized to 0. Second, the condition in the while loop should be $i < sizeof($phoneBrand) without the $i++ because the increment should be done inside the loop. Third, the check for the selected brand should be done inside the loop before displaying the data. Here's a corrected version of the code:

$brandSel = $_POST["brand"];

$i = 0;

//check if user has selected All or a specific brand display selections accordingly

while($i < sizeof($phoneBrand)){

   if($brandSel == "All" OR $brandSel == $phoneBrand[$i]){

       echo "<tr><td></td><td>".$phoneBrand[$i]."</td><td>".$phoneModel[$i]."</td><td>".$phonePrice[$i]."</td></tr>";

   }

   $i++;

}

With this code, the loop iterates through all the elements in the $phoneBrand array, and for each element, it checks if the user has selected "All" or the current brand matches the user's selection. If the condition is true, it displays the data for that brand.

Answer 2

Let me ask you a question: when the if statement executes, what is the value of the variable i?