分为零，php

Question

I have created this function that correctly displays the infinity symbol when trying to enter 0 into the Y text box. However I still get the division by zero error... here is my code.

here is the case for switch statment

case '/':             
    $prod = $x / $y;     
    break;

hh

//check for divide by 0
function check0($y)
{
    if ($y == 0)
        throw new Exception ($prod = "&#8734");

    return FALSE;
 }

 try
 {
    check0($y);
    $prod = $x /$y;   
 }catch(Exception $zero){
     echo $zero->getMessage();
 }

Answer 1

This is because you actually do the division near the top (in the case).