1. Control Statement
PHP - TUTORIAL

2. Selection
● IF
● IF … ELSE
● ELSEIF
● SWITCH

3. Selection - IF
● IF <expression>
statement-true;
● ex.
$name=”kris”;
IF ($name==”kris”)
echo “Welcome Kris.”;

4. Selection – IF … ELSE
● IF <expression>
statement-true;
ELSE
statement-false;

5. Selection – IF … ELSE
● Ex.
$name=”Kris”;
IF ($name=”kris”)
echo “Welcome Kris.”;
ELSE
echo “You're not Kris.”;

6. Selection - ELSEIF
● IF <expression1>
statement-true1;
ELSEIF <expression2>
statement-true2;
ELSE
statement-false;

7. Selection - ELSEIF
$name=”John”;
IF ($name==”Kris”)
echo “Welcome Kris.”;
ELSEIF ($name==”John”)
echo “Welcome John.”;

8. Selection - Switch
Switch (variable) {
case <value1>:
statement-1;
break;
case <value2>:
statement-2;
break;
default:
statement-default;
break;
}

9. Selection - Switch
$destination=”Paris”;
switch ($destination) {
case “Tokyo”:
echo “Bring extra 1000 $US”;
break;
case “Egypt”:
echo “Bring bulletproof vests”;
break;
case “Paris”:
echo “Bring a camera”;
break;
default:
echo “Dont' bring anything”;
break;
}

10. Loop
● While
● Do While
● For
● Foreach

11. Loop - While
● While (expression-true) {
statement; }
● Ex.
$i=0;
While ($i<=10) {
echo $i . “<br />”;
$i++;
}

12. Loop – Do While
Do {
statement;
} while (expression);

13. Loop – Do While
$a=0;
do {
echo $a . “<br/>”;
} while ($a>0);

14. Loop - For
● For (start; stop; increment) {
statement;
}
● Ex.
For ($b=0; $b<=10; $b++) {
echo $b . “<br />”;
}

15. Loop – Foreach
● foreach ($array as $value){
statement;
}
● Ex.
$colors = array("red","green","blue","yellow");
foreach ($colors as $value) {
echo "$value <br>";
}

16. Function
● Is a block of code that can be executed
whenever we need it
● Function <name>(parameters) {
statement;
return
}

17. Simple function
function say() {
echo “Nice to meet you.”;
}
echo “Hello Kris, ”;
say();

18. Function with Parameters
function say($name) {
echo “<br />Nice to meet you, “. $name;
}
echo “Hello, John.”;
say(“John”);

19. Simple function
function say() {
echo “Nice to meet you.”;
}
echo “Hello Kris, ”;
say();

20. Function that returning values
function add($x, $y) {
$total = $x + $y;
return $total;
}
$num=0;
echo “My number is “ . $num . ”<br />”;
$num = add(5,6);
echo “Now, my number is “ . $num;

21. Excercise
1. Write a php program to determine which one is the biggest number
from 2 numbers
2. Write a php program to determine which one is the biggest number
from 3 numbers
3. Write a php program which can determine a number is odd or even
4. Write number from 1 to 20 with while, do while, and for
5. Write even number from 1 to 20 with while, do while, and for
6. Write odd number from 1 to 20 with while, do while, and for

22. Homework
● Write a php program to determine the letter grade from given number
input (hint: use a function to generate the letter grade)
● Add a function to exercise number 1, 2, and 3