What are common reasons for receiving a "HTTP request failed! HTTP/1.0 403 Forbidden" error when trying to read external data in PHP?

The "HTTP request failed! HTTP/1.0 403 Forbidden" error typically occurs when the server refuses to fulfill the request due to insufficient permissions or authentication issues. To solve this problem, you may need to provide proper credentials or check if the server allows access to the requested resource. Additionally, ensure that the URL you are trying to access is correct and accessible.

$url = 'https://example.com/data.json';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Authorization: Bearer your_access_token_here'
));
$response = curl_exec($ch);

if($response === false) {
    echo 'Error: ' . curl_error($ch);
} else {
    echo $response;
}

curl_close($ch);