Variable is not getting stored after submitting the form - php

Question

Sorry if the Title doesn't make any sense.
So, my code is as follows:
<?php
$conn=new mysqli("localhost","root","aman8blue","users");
$conn->connect_error;
$querynor= mysqli_query($conn,"SELECT * FROM userinfo");
$nor=mysqli_num_rows($querynor);
for($i=1; $i<=$nor; $i++) {
?>
<form method='post'>
<label class='switch'><input type='checkbox' name='check' value=1 onChange='this.form.submit()'><span class='slider_round'></span></label>
</form>
<?php
$status = 0;
if(isset($_POST['check'])) {
$status=1;
}
if($status==1) {
echo "WORKING!";
}
else {
echo "NOPE!";
}
}
?>
But no matter what, even if I tick the checkbox, it shows "WORKING!". I can't understand where am I wrong.
(Sorry the previous one was incomplete)
Thanks in Advance!

Answer 1

add
name="check"
in your input since post is looking for name attribute and you don't have one

Answer 2

<?php
$conn = new mysqli("localhost", "root", "xxxx", "users");
$conn->connect_error;
$querynor = mysqli_query($conn, "SELECT * FROM userinfo");
$nor = mysqli_num_rows($querynor);
echo '<form method=\'post\'>';
for ($i = 1; $i <= $nor; $i++)
{
?>
<label class='switch'><input type='checkbox' name='check[<?php echo $nor[$i]['id']; ?>]' value=1 onChange='this.form.submit()' <?php echo (isset($_POST['check'][$nor[$i]['id']]) ? 'checked':''); ?>>
<span class='slider_round'></span>
</label>
<?php
}
echo '</form>';
?>
As the answer to the comment.