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 = "neveropen" 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 $str = "neveropen"; // prints the reversed string echo strrev($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:
http://php.net/manual/en/function.strrev.php
