How to submit a default value in an input text type?

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PHP

Below is a function called add_total(); which i use to save typed input fields user id, name, total and date in a form to save them in my database and works 100%.

but how can i save values in a input field which are default values such as value="1500" and value="<?php echo $_GET['total'] ?>" to my database?

<input  type="text" value="1500" name="total" >

<input  type="text" value="<?php echo $_GET['total'] ?>" name="total" >

every time i submit such input fields my database records 0. please help! and by the way i am still new to php html and javascript.

What I have tried:

function Add_total()
{

$user_id = $_POST['user_id'];
$name = $_POST['name'];
$total = $_POST['total'];
$date = date('Y-m-d h:i:s');

$sql=sprintf("INSERT INTO `users`(`user_id`, `name`, `total`, `status`, `date`) VALUES ('$user_id','$name','$total','0','$date')");

$rs=mysqli_query($this->connection_to_database,$sql) or die(mysqli_error());
return true;
return false;
}</pre>