1. PHP-language Variables, assingment and arithmetic operations
Jouni Juntunen
Oulu University of Applied Sciences
School of Business and Information Management

2. Variables Data prosessed by (web) application is store into variables
PHP-application is executed on web server -> variables are into memory of the web server
When you declare a variable, you don’t give datatype (but still variables do have datatype) -> PHP is so called loosely-typed programming language
Basic datatypes: boolean, integer, floating point number and string

3. Declaring variables Variable declaring starts with $-character
You invent the name for the variable
Good practise is to give initial value
Example:
$somenumber=0;
$sometext=””;
$isTrue=false;

4. Assignment (= operator)
Assingment is used to store data into variable
User input
Result of an clause
Examples.
$name=$_POST[”txtName”];
$total=$number1 + $number2;
$fullname=$forname . $surname;

5. Arithmetic operations
+ addition
- subtraction
/ division
* multiplication
% remainder

6. Reading values from HTML-form using HTTP-post method

7. Printing information with PHP
echo, print ja printf