Write a isPalindrome FunctionWrite a function isPalindrome($str) that returns true if the parameter string is a palindrome (a palindrome is a word or sentence that reads the same forward and backward at the character level). You should ignore non-letter characters when determining if the string is a palindrome. Thus, isPalindrome("A man, a plan, a canal, Panama!") should return true. ```php```In this PHP code snippet, a function named `isPalindrome` is defined. The function is designed to take a single parameter, `$str`, which is expected to be a string. Currently, the function body is empty, indicated by the curly braces `{ }`, and will need to be implemented to perform the intended functionality of checking if the provided string is a palindrome.### Explanation:- **``:** These tags indicate the start and end of a block of PHP code.- **`function isPalindrome($str){}`:** This line defines a function named `isPalindrome` with a parameter `$str`. Inside the curly braces, you would implement the logic to determine if `$str` is a palindrome—a sequence that reads the same forward and backward, such as "madam" or "racecar". Currently, the function does not perform any operations.

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a isPalindrome Function

Write a function isPalindrome($str) that returns true if the parameter string is a palindrome (a palindrome is a word or sentence that reads the same forward and backward at the character level). You should ignore non-letter characters when determining if the string is a palindrome. Thus, isPalindrome("A man, a plan, a canal, Panama!") should return true.