如何使用password_verify()从数据库中检索密码

我正在学习PHP，作为一个项目，我开始建立一个社交网络。我确实创建了注册表单和登录表单，我可以将用户添加到我的数据库。我也对他们的密码进行哈希处理。这是一个简单的网站，工作正在进行中，所以有很多安全漏洞。

我的问题是登录文件，我似乎无法匹配用户和他给我的密码。为了验证用户密码，我使用password_verify()函数，但它似乎不能正常工作。

<?php
//signUp.php
//Here is where I add a user in my database
//I validate the input, confirm that the password is written like it  should be
//check if a user with the same username exists in the database
//if all checks out I will add the user in the database
   //and redirect the user to his profile
   require_once 'login.php';
   require_once 'helperFunctions.php';
$conn = new mysqli($servername, $username, $password, $database);
if(!$conn)
   die("Connection failed:" . mysqli_connect_error());
$myUsername = $_POST['Name'];
$myPassword = $_POST['Password'];
$myConfirm = $_POST['conPass'];
sanitize($conn, $myUsername);
sanitize($conn, $myPassword);
//check if the two passwords are the same
if($myPassword != $myConfirm){
  print "Your passwords don't match";
  header("refresh: 5; index.html");
} else {
   //check if username already exists in database
    $query = "SELECT * FROM members WHERE Username='$myUsername'";
    $result = mysqli_query($conn, $query);
    $count  = mysqli_num_rows($result);
    if($count == 0){
        //hash password
        $hashedPass = password_hash("$myPassword", PASSWORD_DEFAULT);
        //username doesn't exist in database 
        //add user with the hashed password
        $query ="INSERT INTO members (Username, Password) VALUES     ('{$myUsername}', '{$hashedPass}')";
        $result = mysqli_query($conn, $query);
        if(!$result)
            die("Invalid query: " . mysqli_error());
        else{
            print "You are now a member or The Social Network";
            header("refresh: 5; login_success.php");
        }
    } else {
        print "Username already exists";
        header("refresh: 5; index.html");
    }
}
?>

登录

<?php
//checkLogin.php
//Here is where I authenticate my users and if successfull I will show  them their profile
require_once 'login.php';
require_once 'helperFunctions.php';
$conn = new mysqli($servername, $username, $password, $database);
if(!$conn)
    die("Connection failed:" . mysqli_connect_error());
//Values from form
$myUsername = $_POST['Name'];
$myPassword = $_POST['Password'];
//sanitize input
sanitize($conn, $myUsername);
sanitize($conn, $myPassword);
$query = "SELECT * FROM members WHERE Username='$myUsername'";
$result = mysqli_query($conn, $query);
$count = mysqli_num_rows($result);
if($count == 1){
    $row = mysqli_fetch_array($result, MYSQLI_ASSOC);
    print "hashedPass = ${row['Password']}";
    print "myPassword: " . $myPassword;
    if(password_verify($myPassword, $row['Password'])){
        print "Password match";
    } else
        print "The username or password do not match";
} 
?>

    function sanitize($conn, $val){
    $val = stripslashes($val);
    $val = mysqli_real_escape_string($conn, $val);
}