Constants

 

Define constants using the define function, like so:

define("SALES_TAX", .07859358);

define("TEACHER", "Mr. Chagoyan");

define("PI", 3.1415926535);

It is good practice to use all capitals for your constant names for easy identification.

Here's another example: constants.php


<html>
<head>
<title>constants.php</title>
</head>
<body>
<?php
//Interest Calculation

//Set the variables and constants
define("INTEREST_RATE", .19);
$balance1=115000.00;
$balance2=15000.00;
$balance3=177000.00;
$balance4=10000.00;

//Calculate the annual interest amounts for each balance
$annualinterestamount1 = $balance1*INTEREST_RATE;
$annualinterestamount2 = $balance2*INTEREST_RATE;
$annualinterestamount3 = $balance3*INTEREST_RATE;
$annualinterestamount4 = $balance4*INTEREST_RATE;

//Display browser output
print("The annual interest due on your first balance of ".$balance1); 
print(" is ". $annualinterestamount1). " dollars.";
print("<br><br>");

print("The annual interest due on your second balance of ".$balance2); 
print(" is ". $annualinterestamount2). " dollars."; 
print("<br><br>");

print("The annual interest due on your third balance1 of ".$balance3); 
print(" is ". $annualinterestamount3). " dollars."; 
print("<br><br>");

print("The annual interest due on your fourth balance of ".$balance4); 
print(" is ". $annualinterestamount4). " dollars."; 
print("<br><br>");

 
?>

</body>
</html>