In this tutorial, we will show you how to print a number in reverse order using PHP for loop and function.
How to Reverse Number in PHP?
Here are two ways:
- Reverse number program in PHP using loop
- Reserve a number with using the function in PHP
Reverse number program in PHP using loop
Let’s follow the below steps for creating a PHP program for reverse a number using loop and without using any function:-
- Declare a variable and assign number value, which you want to reverse
- Declare a new variable, which you store reverse number and initialize it with 0.
- iterate the number with loop
- Multiply the reverse number by 10, add the remainder which comes after dividing the number by 10 inside the loop.
- Print the reversed number
<?php
//define a variable and assign value
$num = 23456;
//define variable and initialize with 0
$revNo = 0;
// iterate with loop
while ($num > 1)
{
// Multiply the reverse number by 10, add the remainder which comes after dividing the number by 10.
$rem = $num % 10;
$revNo = ($revNo * 10) + $rem;
$num = ($num / 10);
}
//Print the reversed number
echo "Reverse number of 23456 is: $revNo";
?>
Source Code – reverse number program in php using loop
<!DOCTYPE html>
<html lang="en">
<head>
<title>Reverse number in PHP without using any function PHP </title>
</head>
<body>
<h4>Reverse number in PHP without using any function PHP </h4>
<?php
//define a variable and assign value
$num = 23456;
//define variable and initialize with 0
$revNo = 0;
// iterate with loop
while ($num > 1)
{
// Multiply the reverse number by 10, add the remainder which comes after dividing the number by 10.
$rem = $num % 10;
$revNo = ($revNo * 10) + $rem;
$num = ($num / 10);
}
//Print the reversed number
echo "Reverse number of 23456 is: $revNo";
?>
</body>
</html>
Reserve a number with using strrev() function in PHP
You can reverse a number In PHP using the inbuilt PHP function strrev(). Let’s follow the below steps for that.
- Declare a PHP variable and assign the number value to the variable
- Put a declare variable into inside the strrev() and print it
<?php $number = 123456; echo "Reverse string of $number is " .strrev( $number ); ?>
Source Code – Reserve a number with using the function in PHP
<!DOCTYPE html>
<html lang="en">
<head>
<title>Reverse number in PHP with using strrev() function PHP </title>
</head>
<body>
<h4>Reverse number in PHP with using strrev() function PHP </h4>
<?php
$number = 123456;
echo "Reverse number of $number is " .strrev( $number );
?>
</body>
</html>
Conclusion
In this reverse number in PHP tutorial. You have learned how to reverse a number in PHP without using any function In PHP and also learn how to reverse a number using inbuilt PHP function strrev().
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