PHP – if…else…elseif

 

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

 

PHP Conditional Statements

 

Very often when you write code, you want to perform different actions for different conditions. 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

 

The if statement executes some code if one condition is true.

Syntax

 

if (condition) {
code to be executed if condition is true;
}

 

The example below will output “Have a good day!” if the current time (HOUR) is less than 20:

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$t = date(“H”);

if ($t < “20”) {
echo “Have a good day!”;
}
?>

</body>
</html>

 

Output

 

 

PHP – The if…else Statement

 

The if….else statement executes some code if a condition is true and another code if that condition is false.

 

Syntax

 

if (condition) {
code to be executed if condition is true;
} else {
code to be executed if condition is false;
}

 

The example below will output “Have a good day!” if the current time is less than 20, and “Have a good night!” otherwise:

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$t = date(“H”);

if ($t < “20”) {
echo “Have a good day!”;
} else {
echo “Have a good night!”;
}
?>

</body>
</html>

 

Output

 

 

PHP – The if…elseif….else Statement

 

The if….elseif…else statement executes different codes for more than two conditions.

 

Syntax

if (condition) {
code to be executed if this condition is true;
} elseif (condition) {
code to be executed if this condition is true;
} else {
code to be executed if all conditions are false;
}

 

The example below will 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!”:

 

Example

 

<!DOCTYPE html>
<html>
<body>

<?php
$t = date(“H”);
echo “<p>The hour (of the server) is ” . $t;
echo “, and will give the following message:</p>”;

if ($t < “10”) {
echo “Have a good morning!”;
} elseif ($t < “20”) {
echo “Have a good day!”;
} else {
echo “Have a good night!”;
}
?>

</body>
</html>

 

Output