PHP Reverse Number

Syntax

The syntax for reversing a number in PHP is as follows:

string strrev ( string $string )

Example

Here is an example of using the strrev function to reverse a number in PHP.

$num = 12345;
$reverse_num = strrev($num);
echo $reverse_num;

Output

When running the above code, the output will be:

54321

Explanation

The strrev function takes a string as input and returns the reverse of the string. In the above example, the $num variable is converted to a string and then passed to the strrev function, which returns the reverse of the string. The result is then stored in the $reverse_num variable and printed to the screen.

Use

Reversing a number can be useful in a variety of ways, such as for generating unique IDs, validating input data, or formatting output data.

Important Points

• The strrev function can only reverse a string, so the number must be converted to a string before calling the function.
• The function returns a string, so the result must be converted back to a number if needed.

Summary

In PHP, the strrev function can be used to reverse a number by first converting it to a string and then passing it to the function. Reversing a number can be useful in a variety of use cases, such as generating unique IDs or formatting output data.