PHP while loop curl IFisset error - php

Question

Here is my script
$id=$row['user_id'];
if (isset($_GET['trea'])){
$ch = curl_init(); // Initialise a cURL handle
// Setting proxy option for cURL
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXY, '$proxy_ip');
curl_setopt($ch, CURLOPT_HEADER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_COOKIESESSION, TRUE);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 100);
curl_setopt($ch, CURLOPT_URL, $final);
$results = curl_exec($ch); // Execute a cURL request
curl_close($ch);
echo $results;
}
?>
<form action='admin.php' method='get'>
<input type=submit name="trea" value="<?php echo $id ?>">
Now if i click on submit button on my page.It sends CURL request to all the rows instead of that particular row.so i tried to change this
if (isset($_GET['trea'])){
to
if (isset($_GET['$id'])){
and
<input type=submit name="trea" value="<?php echo $id ?>">
to
<input type=submit name="$id" value="<?php echo $id ?>">
And when i try to submit the button.It does nothing.What am i doing wrong? i want to run CURL request on that particular row when i click on submit button of that row