The if, elseif and else statements in PHP are used to perform different actions based on different conditions.
Conditional Statements
Very often when you write code, you want to perform different actions for different decisions.
You can use conditional statements in your code to do this.
- 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
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
| if (condition) code to be executed if condition is true; else code to be executed if condition is false; |
Example
The following example will output “Have a nice weekend!” if the current day is Friday, otherwise it will output “Have a nice day!”:
| <html> <body> <?php $d=date(“D”); if ($d==”Fri”) echo “Have a nice weekend!”; else echo “Have a nice day!”; ?> </body> </html> |
If more than one line should be executed if a condition is true/false, the lines should be enclosed within curly braces:
| <html> <body> <?php $d=date(“D”); if ($d==”Fri”) { echo “Hello!<br />”; echo “Have a nice weekend!”; echo “See you on Monday!”; } ?> </body> </html> |
The ElseIf Statement
If you want to execute some code if one of several conditions are true use the elseif statement
Syntax
| if (condition) code to be executed if condition is true; else if (condition) code to be executed if condition is true; else code to be executed if condition is false; |
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!”:
| <html> <body> <?php $d=date(“D”); if ($d==”Fri”) echo “Have a nice weekend!”; elseif ($d==”Sun”) echo “Have a nice Sunday!”; else echo “Have a nice day!”; ?> </body> </html> |