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PHP if...else...elseif Statements

Conditional statements are used to perform different actions based on different circumstances.

PHP Conditional Statements

Often when you write code, you want to perform different actions in different situations. You can use conditional statements in your code to do this.

In PHP we have the following conditional statements:

• if statement - executes some code if one condition is true
• if...else statement - executes some code if a condition is true and another code if that condition is false
• if...elseif...else statement - executes different codes for more than two conditions
• switch statement - selects one of many blocks of code to be executed

PHP - The if Statement

A statement if we use a certain code if one condition is true.

Syntax

Example

Output "Have a good day!" if the current time (HOUR) is less than 20:

PHP - The if...else Statement

A statement if...else one uses a certain code if the condition is true and another code if that condition is false.

Syntax

Example

Output "Have a good day!" if the current time is less than 20, and "Have a good night!" otherwise:

PHP - The if...elseif...else Statement

The statement that if...elseif...else one uses different codes for more than two situations.

Syntax

Example

Output "Have a good morning!" if the current time is less than 10, and "Have a good day!" if the current time is less than 20. Otherwise it will output "Have a good night!":

PHP - The switch Statement

A statement of switch will be explained in the next chapter.

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