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Conditional statements are used to perform different actions based on different conditions
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 trueif...else statement - executes some code if a condition is true and another code if that condition is falseif...elseif...else statement - executes different codes for more than two conditionsswitch statement - selects one of many blocks of code to be executedThe if statement executes some code if one condition is true.
Syntax
Output "Have a good day!" if the current time (HOUR) is less than 20:
<?php
$t = date("H");
if ($t < "20") {
echo "Have a good day!";
}
?>
The if...else statement executes some code if a condition is true and
another code if that condition is false.
Syntax
Output "Have a good day!" if the current time is less than 20, and "Have a good night!" otherwise:
<?php
$t = date("H");
if ($t < "20") {
echo "Have a good day!";
}
else {
echo
"Have a good night!";
}
?>
The if...elseif...else statement executes different codes for more than two
conditions.
Syntax
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
$t = date("H");
if ($t < "10") {
echo "Have a good morning!";
}
elseif ($t < "20") {
echo "Have a good day!";
} else {
echo "Have a good night!";
}
?>
The switch statement will be explained in the next chapter.
Output "Hello World" if $a is greater than $b.
$a = 50;
$b = 10;
> {
echo "Hello World";
}