I created a form here: http://nonstopshuttleservice.com/point_point_res.htm

It calculates the cost of the ride and adds for things like number of passengers & if they want to add a gratuity.

Would it be possible to check for the value entered into the text box and see if matches my promo code so it would equal a number like 5 or 10 for a 5 or 10 dollar discount. Once I get
$promo=5;
I know how to use that to deduct from my total but I don't know how to use an if statement to see if what they typed in the box equals my promo code.

Could someone possibly give me an example if this is possible?

thanks!

Are you using PHP to check for this after they click submit? If so, you be able to check for it using a simple if statement.

PHP Code:

if($promo == 5) {
   //statements go here if true
} else {
   //statement go here if false
} 


Also, if you have more than one promo code you could use an array.

PHP Code:

$promo_codes = array(5,10); //separate promo codes with a comma
if(in_array($promo,$promo_codes)) {
   //statements go here if true
} else {
   //statement go here if false
} 


So if they entered a code in the text box "promocode" and they need to enter the word "sale" for the promo code to equal a 5 dollar discount. Then if they enter the correct promo code "sale" into the text box, I need a variable like $discount=5, so:

if($promocode == sale) {
   $discount=5
} else {
   $discount=0
}

Would that work?

Then in my php form I could have something like:

$total=$subtotal-$discount

to display the total minus the discount.

thanks!

Got it figured out, thanks for the help!!

Sorry but didn't figure out the array.
If I use this for one code it works:

if($promocode == 'sale') {;
   $discount=5; 
} else {
   $discount=0;
};

If I try this I get an error on this line:
$promo1=5,$promo2=5;

$promo_codes = array(sale,bucks); 
if(in_array($promo1,$promo2)) {;
   $promo1=5,$promo2=5;
} else {
   $promo1=0,$promo2=0;
};

Any help appreciated

Well firstly, you can't declare two varies on a single line like that.

Secondly, you're not using the in_array() function properly because you need to actually give the array. The declaration for the function is:

PHP Code:

in_array(needle,haystack) 


The needle being the promo code you're looking for, and the haystack being the array of good promo codes you're looking for. If you have a word for every discount, then you can use a 2D array to store them.

PHP Code:

$promo_codes = array("sale5"=>5,"sale10"=>10); //separate promo codes with a comma
if(in_array($promo,$promo_codes)) {
   $discount=$promo_codes[$promo];
} else {
   $discount=0;
}
$total=$subtotal-$discount; 


So every value in the array will look like this, each one separated by commas:

PHP Code:

"PROMO_CODE"=>DISCOUNT_VALUE 


Hope that makes sense :-) It's a last faster and shorter than using a series of IF statements for every code you have.

What if you plan to give away more than a hundred promo codes?
Better way to do this is to use database instead of array.
You need only two fields.
One would be if a promo code has already been used (0 or 1) and the second is generated by you:

PHP Code:

$promocode = rand(9999999999); //generates a random number from 0..9999999999