Online PHP editor | rfc for NlsF9

@ 2022-05-23T08:22:28Z

<?php

function is_palindrome($str) {
    $len = strlen($str);
    if ($len < 2) {
        // strings of 0 or 1 characters are palindromes
        return true;
    }
    elseif ($str[0] != $str[$len-1]) {
        // first character doesn't match last character, so not a palindrome
        return false;
    }
    else {
        // first character is equal to last character, 
        // so see if the rest of the string is a palindrome
        return is_palindrome(substr($str, 1, $len - 2));
    }
}

foreach (['rotor', 'a', 'deed', 'hello', 'xyyz'] as $str) {
    echo "\"$str\" is" . (is_palindrome($str) ? "" : " not") . " a palindrome\n";
}

function is_palindrome_broken($str) {
    $len = strlen($str);
    if ($len < 2) {
        // strings of 0 or 1 characters are palindromes
        return true;
    }
    elseif ($str[0] != $str[$len-1]) {
        // first character doesn't match last character, so not a palindrome
        return false;
    }
    else {
        // first character is equal to last character, 
        // so see if the rest of the string is a palindrome
        is_palindrome_broken(substr($str, 1, $len - 2));
    }
}

foreach (['rotor', 'a', 'deed', 'hello', 'xyyz'] as $str) {
    echo "\"$str\" is" . (is_palindrome_broken($str) ? "" : " not") . " a palindrome\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: "rotor" is a palindrome "a" is a palindrome "deed" is a palindrome "hello" is not a palindrome "xyyz" is not a palindrome "rotor" is not a palindrome "a" is a palindrome "deed" is not a palindrome "hello" is not a palindrome "xyyz" is not a palindrome

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