How to shorten a url using php?

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$access_token = 'YOUR_BITLY_ACCESS_TOKEN';
$long_url = 'https://www.example.com';

$api_url = 'https://api-ssl.bitly.com/v4/shorten';
$data = ['long_url' => $long_url];
$headers = [
    'Authorization: Bearer ' . $access_token,
    'Content-Type: application/json'
];

$ch = curl_init($api_url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

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

$short_url = json_decode($response)->link;

echo 'Short URL: ' . $short_url;