php+mysqli uses preprocessing technology to perform database queries, mysqli preprocessing_PHP tutorial

$mysqli = new MySQLi("localhost","root","123456","liuyan");
if(!$mysqli){
die($mysqli->error);
}
//Create a predefined object?Placeholder
$sql = "select id,title,contents from news where id>?";
$mysqli_stmt = $mysqli->prepare($sql);
$id=10;
//Bind parameters
$mysqli_stmt->bind_param("i",$id);
//Bind result set
$mysqli_stmt->bind_result($id,$title,$contents);
//Execute
$mysqli_stmt->execute();
//Get the bound result set
while($mysqli_stmt->fetch()){
echo "--$id--$title--$contents--

---

";
}
//Close the result set
$mysqli_stmt->free_result();
$mysqli_stmt->close();
$mysqli->close();
?>