How to check a value of a variable and call different function - php

Question

I have the following variables in my cart.php file:
<?php $readyTotal = $qty*price ?>;
Now I want to do is that if the $readyTotal > $1000 then call a file which is adding an item into the customer's cart.
($slq= msyql_query("INSERT into `table`.....value.....");
and if the value of $radyTotal < $1000;
dont add any extra item or if it has been added just remove it by calling the removal file.
($sql =mysql_query("DELETE from `table` where .......");
Please note that how to do this I want to call/include the files in my cart.php file. but i am unable to do this. is there any other way to do it or by using ajax/jquery which check every the value of $readyTotal every time when it changes.
function ad(){
$signature =getSignature();
$item = 21;
$type = 100;
$type= 0;
$sql2 = mysql_query("Select * From `temp` where `item`='$item' AND `price`= 0 AND
`signature`='$signature' AND `type`=0 AND `toppings`=0 " );
$count= mysql_num_rows($sql2);
if($count ==0){
$sql = mysql_query("INSERT INTO `temp`
(`item`,`price`,`signature`,`type`,`toppings`, `isCoupon`)
VALUES
('$item','$type','$signature','0','0', '1')");
}
}
function removeMe(){
mysql_query("DELETE FROM `temp` WHERE `item`=21 AND `signature`='".getSignature()."'");
}
When I try the above function individual file it works fine, but when i use both in it does not woks please.... what is wrong with this...

Answer 1

<?php
include_once("customfunctionfile.php");
$object = new quiz;
$readyTotal = $qty*price ;
if($readyTotal > 1000){
$object->ad();
}else{
$object->removeMe();
}
?>;
customfunctionfile.php
class quiz{
function ad(){
$signature =getSignature();
$item = 21;
$type = 100;
$type= 0;
$sql2 = mysql_query("Select * From `temp` where `item`='$item' AND `price`= 0 AND
`signature`='$signature' AND `type`=0 AND `toppings`=0 " );
$count= mysql_num_rows($sql2);
if($count ==0){
$sql = mysql_query("INSERT INTO `temp`
(`item`,`price`,`signature`,`type`,`toppings`, `isCoupon`)
VALUES
('$item','$type','$signature','0','0', '1')");
}
}
function removeMe(){
mysql_query("DELETE FROM `temp` WHERE `item`=21 AND
`signature`='".getSignature()."'");
}
}

Answer 2

You can achieve this something like this using functions without including file.
<?php
$readyTotal = $qty*price;
if($readyTotal > 1000) //considering amount in $
{
addItemToCart($cartDetails) // call function to add item into the cart
}
else {
removeItemFromCart($cartDetails) //call function to remove item from cart
}
?>
Define functions addItemToCart and removeItemFromCart to fire your queries.