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

2. Control structures Conditional structures – If – Switch Loops – While – For Functions http://us.php.net/manual/en/language.control- structures.php http://us.php.net/manual/en/language.control- structures.php

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”; } else { if ($grade<5) { print ”B”; } else { if ($gade==5) { print ”A”; } else { 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 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/~teraisan/K1053BI/exerci se.htm http://www.oamk.fi/~teraisan/K1053BI/exerci se.htm Exercises 6 to 10 are about conditional statements