linguistic-php-functions.php

<?php

// PHP has a number of built-in functions that allow you to perform
// linguistic operations on strings with knowledge of phonetics,
// as well as the English language rules and pronunciations.

// Calculate the metaphone key of a string
echo metaphone('test'); // TST

// Calculate the soundex key of a string
echo soundex('test'); // T230

// Calculate Levenshtein distance between two strings
echo levenshtein('test', 'tset'); // 2