HTMLify

class Solution {

    /**
     * @param String $s
     * @param String $t
     * @return Boolean
     */
    function isSubsequence($s, $t) {
        $lenS = strlen($s);
        $lenT = strlen($t);

        $i = 0; 
        $j = 0; 

        while ($i < $lenS && $j < $lenT) {
            if ($s[$i] === $t[$j]) $i++;
            $j++;
        }

        if ($i === $lenS) return true;
        else return false;
    }
}