Palindrome-UTF8

Find whether inputed string is palindrome ( you could read it from the left to the right same as right-to-left). Script does not works with any punctuation symbols. Works for only alphabetic symbols.

I wrote this script for one of my job reviews.

Licensed MIT.

Methods and outputs

The main method of the class is testString('STRING HERE');

It will test given string for palindrome. If it so, this function will output full given string.

Example

For given input:

$pal->testString('Sum summus mus'); // tests

Output:

Sum summus mus

If the full string is not a palindrome, but it contains a palindromes it will output longest of inner palidnromes.

To do so class uses it's protected method findLongestPalindrome($str); This functions calls another public method getSubstrings($wordsArray); which returns all possible substrings for given words array.

Make sure to filter and preserve only unique values, as the function will return many empty strings and many repeats.

$allPossibleSubstrings = array_filter(array_unique($this->getSubstrings($words)));

Example

For given input:

$pal->testString('Аргентина манит негра раз А роза упала на лапу Азора два три'); // tests

Output:

А роза упала на лапу Азора

If given string does not contains a palindrome this method will output only the first character of string.

Example

For given input:

$pal->testString('Тестируем не палиндром'); // tests

Output:

Т

Function that tests given string for palindrome

protected function isPalindrome($str);

Return values : bool (true) if given string is fully a palindrome bool (false) if other

Function to get all possible substrings from a given words array

public function getSubstrings($wordsArray, &$substrings = array());

Return: NOT UNIQUE AND CONTAINS EMPTY VALUES Array of substrings

Method to find the longest inner palindrome in the string

protected function findLongestPalindrome($str);

Return: String contains only longest found palindrome.

Setup and using

1. First you need to include class file to the project

require_once ('Palindrome.php'); // load class file

2. Then set internal encoding to UTF-8.

mb_internal_encoding('utf8'); // set encoding for UTF-8

3. Create class instance

$pal = new Palindrome(); // create new object for palindrome

4. Use it

$pal->testString("Аргентина манит негра"); // tests
$pal->testString('Sum summus mus'); // tests
$pal->testString('Тестируем не палиндром'); // tests
$pal->testString('Аргентина манит негра раз А роза упала на лапу Азора два три'); // tests

Given inputs will output the following:

Аргентина манит негра
Sum summus mus
Т
А роза упала на лапу Азора