Reversing a string is one of the most basic string operations and is used very frequently by developers and programmers. PHP comes with a built-in function to reverse strings.
The strrev() function is a built-in function in PHP and is used to reverse a string. This function does not make any change in the original string passed to it as a parameter.
Syntax:
string strrev($inpString)
Parameter: This function accepts a single parameter $inpString. This parameter is a string and it specifies the string which we want to reverse. If a number is passed to it instead of a string, it will also reverse that number.
Return Value: The strrev() function returns the reversed string or the number. It does not make any change to the original string or number passed in the parameter.
Examples:
Input : $string = "geeks"
Output : skeeg
Input : $string = 143
Output : 341
Below programs illustrate the strrev() function in PHP:
Program 1: PHP program to demonstrate the strrev() function when a string is passed.
PHP
<?php
// PHP program to demonstrate the
// strrev() function when a string is passed
$str = "geeks";
// prints the reversed string
echo strrev($str);
?>
Output:
skeeg
Program 2: PHP program to demonstrate the strrev() function when a number is passed.
PHP
<?php
// PHP program to demonstrate the
// strrev() function when a number is passed
// passing number instead of string
$num = 134;
// prints the reversed number
echo strrev($num);
?>
Output:
431
Reference:
https://www.php.net/manual/en/function.strrev.php