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A blog site which I am posting to during my learning of the popular programming language PHP. Feel free to leave comments!

• PHP - Conditional Statements

  Posted on April 6th, 2009 admin No comments

  In PHP, you can use Conditional Statements to make decisions. Let’s say you wanted to give your customer a discount if he/she has an order over £5 (I know I’m generous!). You can easily do this by using the ‘If’ statement.

  Let’s create the IF statement:

  <?php

  define(’CHOCOLATECAKE’, 3.50);
  define(’SWISSROLL’, 1.50);

  $subtotal = CHOCOLATECAKE + SWISSROLL;

  echo “Sub total of your order: £” . $subtotal . “. Thanks for visiting! “;

  if( $subtotal >= 5.00 )

  {

  $totalcost = ($subtotal * 0.90);

  $grandtotal = number_format($totalcost,2);

  echo “This order qualified for a discount! “;

  echo “Your grand total is: £” . $grandtotal;

  }

  else {

  $subtotal = number_format($subtotal,2);

  echo “Your grand total for your order is £” . $subtotal;

  }

  ?>

  As you may notice I am charging customer’s 3.50 for the cake and 1.50 for the swiss roll. If the customer bought both of these (equalling £5) it would be eligable for discount!  The basic princpiple is that if the $subtotal is over the value of 5 then it creates a new variable called $totalcost. The $totalcost is worked out by the $subtotal being multiplied by 0.90 to subtract 10% off the order.

  You will also notice there is an ‘Else’ function in there as well. If the ‘If’ function turns false (as in the order is below £5) the ‘Else’ function is performed. The Else funtion in this script will output the $subtotal variable if the order is below £5

  The layout of writing an IF statement is as follows:          if (your argument here) {commands here}

  (Post created on Monday, April 6th 09 at 17:30)

  PHP Conditional Statements, Constants, Else Function, IF Function, PHP, Variables