Convert command line curl into PHP curl

Question

I am having problems getting my command line curl command to work with PHP.

working command line curl below

 curl http://localhost:11434/api/chat -d '{"model":"deepseek-r1:1.5b","messages":[{"role":"user","content":"what is your name"}]}'

PHP curl not working. code below

<?php 
$url = 'http://localhost:11434/api/chat -d';
$question = $_GET["q"];
$model = 'deepseek-r1:1.5b';

$data = array(
    "model" => $model, 
    "messages" => array(  
        array(
            "role" => "user",
            "content" => $question,                    
        )
    ),
);

$payload = json_encode($data);

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");  
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$result = curl_exec($ch);
curl_close($ch);

$response = json_decode($result, true);

echo $response;
?>

Your guidance is greatly appreciated!