An if statement lets you control program execution based on conditional expressions. It has three parts: 1. The beginning starts with the word "if" 2. The conditional statement specifies what is being checked using variables, operators, values in parentheses 3. The execution section enclosed in curly brackets runs if the condition is true

1. If Statements
By Toni Norman

2. An if statement lets you control the execution
of statements based on the results of one or
more conditional expressions.
else if
if
else
;( )
$name
{ } =

3. Parts of an If Statement
if ($price <= 0) {
$message = ‘Price must be greater than zero.’;
}
1. Beginning
The beginning of the statement starts with “if”. Make sure it is not
capitalized.
2. Conditional Statement
The conditional statement tells what it is checking for.
3. Execution Section
The execution section tells what is to be done if the condition is
met or true.

4. Beginning
You can have just one if statement
like the one shown above.
if ($price <= 0) {
$message = ‘Price must be greater than zero.’;
}

5. Beginning
if ($price <= 0) {
$message = ‘Price must be greater than zero.’;
} else {
$message =‘This is the correct price’;
}
You can add an else statement to execute a
second action if the statement is true.

6. Beginning
if ($price <= 0) {
$message = ‘Price must be greater than zero.’;
} else if (price <= 5){
$message =‘You may want to increase the price’;
} else
$message =‘This is a good price’
}
You can also add an else if statement , but must
also enter a second condition to test.

7. Conditional Statement
Parenthesis
($price <= 0)
Variable
Value
Operator
The conditional statement needs parenthesis, a variable, an
operator and a value.

8. Here is a
chart of the
conditional
operators
that you can
use in the
conditional
statement.
Conditional Statement

9. {
$message = ‘Price must be
greater than zero.’;
}
Execution Statement
Curly
Brackets
Variable
Equal Sign
Value
Semi Colon
Quotation
Marks
The execution statement needs curly brackets, a
variable, an equal sign, quotation marks around the
value statement and ends with a semi-colon.

10. Summary
if
1. Beginning
The beginning of the statement starts with “if” and make sure it is
not capitalized.
2. Conditional Statement
The conditional statement that tells what it is checking for.
3. Execution Section
The execution section tells what is to be done if the condition is
met or true.
$message = ‘Price must be greater than zero.’;
}
($price <= 0) {