MySQL Update with PHP not working how i wanted it to - php

Question

Hi this is my first post so please excuse any errors
Background if this helps
i've created several pages for a website
submit form - puts data in to database - all working ok
summary page - pulls through elements of database - all working ok
edit page - this is where my problem is
my problem
when creating a edit page it does not pull through the updated variable from the form and just updates the database with a empty field
so here is the code
edit.php
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$var_value = $_GET['id'];
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
?>
<form action="/update.php" method="post">
<label>Property Title
<input type="text" name="title" value="<?php echo $row[title]?>" />
<form method='get' action='update.php'>
<input type='hidden' name='id' value= "<?php echo $row[id]?>" >
<input type='submit' class='button radius' value='update' >
</form>
</label>
so that should display whats currently in the database then when a user changes it they click update and it should up date in the database
here is the update.php
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$title =$_POST['title'];
$var_value = $_GET['id'];
$result = $conn->query($sql);
$sql = "UPDATE aparthousesalerent SET title='$title' WHERE id = '$var_value' ";
echo $var_value;
echo $title;
if ($conn->query($sql) === TRUE) {
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
i added in the extra line of echo $var_value and echo $title; to check if that worked and it did but it still doesn't pass it through to the database
thanks for looking

Answer 1

<form action="/update.php" method="post">
<label>Property Title
<input type="text" name="title" value="<?php echo $row[title]?>" />
<form method='get' action='update.php'>
<input type='hidden' name='id' value= "<?php echo $row[id]?>" >
<input type='submit' class='button radius' value='update' >
</form>
as you can see there are nested form
So, remove the form and make method post because you are using $_POST in php file.
<form action="/update.php" method="post">
<label>Property Title
<input type="text" name="title" value="<?php echo $row[title]?>" />
<input type='hidden' name='id' value= "<?php echo $row[id]?>" >
<input type='submit' class='button radius' value='update' >
</form>
and use one either GET or POST
$title =$_POST['title'];
$var_value = $_POST['id'];