PHP ─ Decision Making

The if, elseif ...else and switch statements are used to take decision based on the different condition.

You can use conditional statements in your code to make your decisions. PHP supports the following three decision making statements:

• if...else statement - use this statement if you want to execute a set of code when a condition is true and another if the condition is not true
• elseif statement - is used with the if...else statement to execute a set of code if one of several condition are true
• switch statement - is used if you want to select one of many blocks of code to be executed, use the Switch statement. The switch statement is used to avoid long blocks of if..elseif..else code.

The If...Else Statement

If you want to execute some code if a condition is true and another code if a condition is false, use the if....else statement.

Syntax


Example

The following example will output "Have a nice weekend!" if the current day is Friday, otherwise it will output "Have a nice day!":


It will produce the following result:


The ElseIf Statement

If you want to execute some code if one of the several conditions is true, then use the elseif statement.

Syntax


Example

The following example will output "Have a nice weekend!" if the current day is Friday, and "Have a nice Sunday!" if the current day is Sunday. Otherwise it will output "Have a nice day!":


It will produce the following result:


The Switch Statement

If you want to select one of many blocks of code to be executed, use the Switch statement. The switch statement is used to avoid long blocks of if..elseif..else code.

Syntax


Example

The switch statement works in an unusual way. First it evaluates the given expression, then seeks a label to match the resulting value. If a matching value is found, then the code associated with the matching label will be executed. If none of the labels match, then the statement will execute any specified default code.


It will produce the following result:

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