PHP Index

In order to become familiar with PHP programming structures and commands, we will build various PHP pages. Sections of this page will explain each PHP command, provide a link to a working sample, and detail the working sample's PHP code. Let's get started:

Datatypes

Variables and constants hold specific datatypes. These include:
  • Boolean: Holds true or false values (1 or 0).
  • Integer: Holds numbers with no decimals, such as -10, 0, 5, 10, etc.
  • Double: Holds decimals numbers (Floats), such as 9.25 and 10.2528.
  • String: Holds characters, such as "Car", "Toe", "7-11 Stores" and "9-11."
  • Array: See Arrays.
  • Object: See Objects.
  • Resource: See MySQL.
  • Null: Holds the value NULL.
Here's an example of variables using several datatypes: datatypes.php


<html>
<head>
<title>datatypes.php</title>
</head>
<body>
<?php
//Online Banking Balance Display

//Set the variables
$yearsofservice=10; //integer
$balance=115000.00; //double
$message = "Welcome to Bank of Coalinga."; //string
$vip=true; //boolean

//Display browser output
print("<h1>".$message."</h1>");
print("Your balance is ".$balance);
print("<br><br>");
print("VIP Status: ".$vip);
print("<br><br>");
print($yearsofservice." year customer.");

?>

</body>
</html>