1. PHP-language, conditional statements
Jouni Juntunen
Oulu University of Applied Sciences
School of Business and Information Management

2. Control structures Conditional structures Loops FunctionsIf
Switch
Loops
While
For
Functions

3. Basic syntax
if (expression) {
... }
else

4. Comparison operators

5. Example
<? //Read value passed from HTML-form. $age=$_POST[’age’]; //Found out if user is minor or adult according to age. if ($age<18) { print ”Minor”; } else print ”Adult”; ?>

6. Nested statements
<? $grade=$_POST[’grade’]; If ($grade==0) { print ”F”; } else if ($grade<3) print ”C”; if ($grade<5) print ”B”; if ($gade==5) print ”A”; print ”Not on scale”; ?>

7. Logical operations
|| OR
&& AND
! NOT

8. Example
<? $grade=$_POST[’grade’]; //If grade is not between 0 and 5 it is //not on scale. If ($grade<0 || $grade>5) { print ”Not on scale”; } ?>

9. Switch
Sometimes you can replace multiple if-statements with switch statement
Also logical and comparison operators are allowed

10. Exercises http://www.oamk.fi/~jjuntune/php/exercises.php
Exercises 6 to 10 are about conditional statements