How can I integrate AI image generation into a PHP web app?

<!-- BEGIN COPY / PASTE -->
    $apiKey = 'your_api_key_here';
    $prompt = 'A futuristic cityscape at sunset';
    $url = 'https://api.example.com/generate-image';

    $data = [
      'prompt' => $prompt,
      'api_key' => $apiKey
    ];

    $options = [
      'http' => [
        'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
        'method'  => 'POST',
        'content' => http_build_query($data),
      ],
    ];

    $context  = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
    if ($result === FALSE) { /* Handle error */ }

    echo $result;
    <!-- END COPY / PASTE -->