mysqli_real_escape_string未定义的索引

Question

我得到这些错误。代码是否错误？

注意：未定义索引：第15行的C：\ xampp \ htdocs \ se \ submit.php中的ID

注意：未定义的索引：第16行的C：\ xampp \ htdocs \ se \ submit.php中的名称 记录添加成功。

第15和16行是$ id = mysqli_real_escape_string（$ link，$ _POST ['id']）;     $ name = mysqli_real_escape_string（$ link，$ _POST ['name']）;分别。

/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */

$link = mysqli_connect("localhost", "root", "", "se");

// Check connection

if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}

// Escape user inputs for security
$id = mysqli_real_escape_string($link, $_POST['id']);
$name = mysqli_real_escape_string($link, $_POST['name']);


// attempt insert query execution
$sql = "INSERT INTO blankdatabase (id, name) VALUES ('$id', '$name')";

if(mysqli_query($link, $sql)){
    echo "Records added successfully.";
} else{
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}

// close connection
mysqli_close($link);

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