PHP if...else Statements

The if...else statements are fundamental control flow structures used to execute code based on certain conditions.

Syntax

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

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

Have a good day!

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 first condition is false and this condition is true;
} else {
// code to be executed if all conditions are false;
}

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!":

<!DOCTYPE html>
<html>
<body>

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

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

The hour (of the server) is 10, and will give the following message: Have a good day!

Operator	Name	Result
and	And	True if both conditions are true
&&	And	True if both conditions are true
or	Or	True if either condition is true
\|\|	Or	True if either condition is true
xor	Xor	True if either condition is true, but not both
!	Not	True if condition is not true