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;
}
Example:
if (5 > 3) {
echo "Have a good day!";
}
Output :
"Have a good day!" if 5 is larger than 3:
We can also use variables in the if statement:
Example:
$t = 14;
if ($t < 20) {
echo "Have a good day!";
}
Output:
Have a good day!
Here are the PHP comparison operators to use in if statements:
Operator Name Result
== Equal Returns true if the values are equal
=== Identical Returns true if the values and data types are identical
!= Not equal Returns true if the values are not equal
<> Not equal Returns true if the values are not equal
!== Not identical Returns true if the values or data types are not identical
> Greater than Returns true if the first value is greater than the second value
< Less than Returns true if the first value is less than the second value
>= Greater than or equal to Returns true if the first value is greater than, or equal to, the second value
<= Less than or equal to Returns true if the first value is less than, or equal to, the second value
To check more than one condition, we can use logical operators, like the && operator:
Example:
Check if $a is greater than $b, AND if $a is less than $c:
$a = 200;
$b = 33;
$c = 500;
if ($a > $b && $c < $a ) {
echo "Both conditions are true";
}
Here are the PHP logical operators to use in if statements:
Operator Name Description
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
We can compare as many conditions as we like in one if statement:
Check if $a is either 2, 3, 4, 5, 6, or 7:
$a = 5;
if ($a == 2 || $a == 3 || $a == 4 || $a == 5 || $a == 6 || $a == 7) {
echo "$a is a number between 2 and 7";
}