1. PHP-language Variables, assingment and arithmetic operations Teppo Räisänen Principal Lecturer Oulu University of Applied Sciences School of Business and Information Management teppo.raisanen@oamk.fi, 050 382 6587

2. Variables Data prosessed by (web) application is stored into variables PHP-application is executed on web server -> variables are in the 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: $age=0; $firstname=””; $isTrue=false;

4. Assignment (= operator) Assingment is used to store data into variable – User input – Result of an clause Examples. $age=24; $name=$_POST[”firstname”]; $total=$number1 + $number2; $fullname=$firstname. $surname;

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

6. Printing information with PHP echo, print ja printfprintf

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