delete-user.php

<?php

//Thank SQL:    https://www.w3schools.com/sql/sql_delete.asp
//              https://www.tutorialspoint.com/mysqli/mysqli_delete_query.htm

$servername = "localhost"; //ใช้ localhost กรณี server อยู่บน online 
$username = "พิมพ์ที่นี่"; //username ของ DirectAdmin
$password = "พิมพ์ที่นี่"; //password ของ DirectAdmin
$dbname = "test"; //ชื่อ database

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

//Get data from app
$userId = $_POST['userId'];
//Filter on DB
$sql = "DELETE FROM user_login_test WHERE id='$userId'";
//Check result
if ($conn->query($sql) === TRUE) {
    echo "Delete successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>