مقایسه دو رشته فارسی چند کلمه ای با هم و دریافت درصد تشابه

[MJmoonwalk]

function similar_check ($str1, $str2) {
    $str1_len = mb_strlen($str1, 'UTF-8');
    $str2_len = mb_strlen($str2, 'UTF-8');
    
    if ($str1_len > $str2_len) {
        $big_str = $str1;
        $small_str = $str2;
    }
    else {
        $big_str = $str2;
        $small_str = $str1;
    }

    $length = 0;
    $big_arr = explode (" ", $big_str);
    $small_arr = explode (" ", $small_str);
    $big_count = count ($big_arr);
    $small_count = count ($small_arr);

    $same_found = 0;
    foreach($small_arr as $word)
    {
        $word = trim($word);
        foreach($big_arr as $word2)
        {
            $word2 = trim($word2);
            if($word == $word2) $same_found++;
        }
    }
    $length = $big_count + $small_count;
    var_dump($length, $same_found);
    $percent = ($same_found*100)/$length;
    return $percent;
}