PHP function Exercises: Checks whether a passed string is a palindrome or not

Last update on May 31 2025 12:56:47 (UTC/GMT +8 hours)

6. Palindrome Checker

Write a PHP function that checks whether a passed string is a palindrome or not?

A palindrome is word, phrase, or sequence that reads the same backward as forward, e.g., madam or nurses run.

Pictorial Presentation:

PHP function Exercises: Checks whether a passed string is a palindrome or not

Sample Solution:

PHP Code:

<?php
// Define a function to check if a string is a palindrome
function check_palindrome($string) 
{
    // Check if the reversed string is equal to the original string
    if ($string == strrev($string))
        return 1; // Return 1 if it is a palindrome
    else
        return 0; // Return 0 if it is not a palindrome
}
// Test the function with the string 'madam' and display the result
echo check_palindrome('madam')."\n"; // Output: 1 (true) since 'madam' is a palindrome
?>

Output:

Explanation:

In the exercise above,

The function "check_palindrome()" takes a string '$string' as input.
Inside the function, it uses the "strrev()" function to reverse the input string.
It then compares the reversed string with the original string using the equality operator (==).
If the reversed string is equal to the original string, it returns 1, indicating that the string is a palindrome.
If the reversed string is not equal to the original string, it returns 0, indicating that the string is not a palindrome.

Flowchart :

For more Practice: Solve these Related Problems:

Write a PHP function to determine if a string is a palindrome, ignoring spaces, punctuation, and case differences.
Write a PHP script to check if a given numeric string is a palindrome and return a boolean result.
Write a PHP program to check palindromicity recursively, comparing the first and last characters and stripping them away until the string is empty or a single character remains.
Write a PHP function to test if a phrase is a palindrome by removing non-alphanumeric characters and comparing it to its reverse.

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