PHP: Remove duplicates items of an array based on similarities

array_remove_similar.php

<?php

/**
 * This functions runs like array_unique but is based on similarity
 * and the math is based on similar_text to know better, see: php.net/similar_text
 * 
 * @param  [type]  $array    [description]
 * @param  integer $howMuch  [description]
 * @param  [type]  $callback [description]
 * @return [type]            [description]
 */
function array_remove_similar($array, $howMuch = 90, $callback = null)
{
    // clone array
    $newArr = array_merge(array(), $array);

    $similars = function($needle, $haystack, $key2ignore) use ($howMuch) {
        $keys = [];
        foreach ($haystack as $key => $value)
        {
            
            if($key === $key2ignore)
                continue;

            similar_text($needle, $value, $p);
            if($p >= $howMuch)
                $keys[] = $key;
        }
        return $keys;
    };

    foreach ($array as $key => $value)
    {
        $keys = $similars($value, $array, $key);
        foreach ($keys as $k) {
            unset($newArr[$k]);
        }
    }
    return $newArr;
}