如何编辑我的代码，以便在输入的单词是数组值的子字符串时返回true？

In the following example, the result is FOUND.

I want however to make 1 change to this, to echo found when the $string = 'welc to my city' that means that if the string contains some of the letters of a word found in the array.

$string = 'welcome to my city';
$array = array("welcome","sunny");
if(0 < count(array_intersect(explode(' ', strtolower($string)), $array))) {
  echo 'found';
}

Examples

welcome to my city // true
welc to my city //true
welcomelkjdfs to my city //true
hi how are you // false
is it sunny? // true
what a big bright sun //true

I can't say about one change. But here is solution in one line

if(0 < count(
        array_filter(
            array_map(function ($value) use ($array) {
                foreach ($array as $word) {
                    if (strpos($word, $value) !== false || strpos($value, $word) !== false) {
                        return true;
                    }
                }
            }, explode(' ', $string)))
    )
) {
    echo 'found';
};