phpstorm代码完成不适用于php方法

Question

For some reason code completion is worry on native php code such as bind_param(), prepare() and execute(). I get this warning: method 'bind_param' not found in class. What is the problem?

if ($this->comparePassword ( $password, $confirmPass )) {

            // Generating password hash
            $password_hash = PassHash::hash ( $password );

            // insert query
            $stmt = $this->conn->prepare ( "INSERT INTO seeker(first_name, last_name, email, password, parish) values(?, ?, ?, ?, ?)" );
            $stmt->bind_param ( "sssss", $fName, $lName, $email, $password_hash, $parish );

            $result = $stmt->execute ();

            $stmt->close ();

            // Check for successful insertion
            if ($result) {
                // User successfully inserted
                return USER_CREATED_SUCCESSFULLY;
            } else {
                // Failed to create user
                return USER_CREATE_FAILED;
            }
        } else {
            return PASSWORDS_DO_NOT_MATCH;
        }
    } else {
        // User with same email already existed in the db
        return USER_ALREADY_EXISTED;
    }

Here is the code for the custom class

class DbConnect {

private $conn;

function __construct() {        
}

/**
 * Establishing database connection
 * @return database connection handler
 */
function connect() {
    include_once dirname(__FILE__) . './Config.php';

    // Connecting to mysql database
    $this->conn = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME); //EDIT TO BE PDO

    // Check for database connection error
    if (mysqli_connect_errno()) { //EDIT TO BE PDO
        echo "Failed to connect to MySQL: " . mysqli_connect_error(); //EDIT TO BE PDO
    }

    // returning connection resource
    return $this->conn;
}

}

Answer 1

Apparently in my DbConnect class my PHPDoc comments stated that I was returning 'database' when in fact I was returning a 'mysqli' datatype. This was what was causing the error. The simply fix to this problem was to change be PHPDoc annotation to 'mysqli' and the code completions started to work again.

Answer 2

the @return database connection handler annotation is telling PhpStorm that you're returning a type 'database'. You are actually returning a 'mysqli' object, so you should have the annotation be @return mysqli the database connection handler