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CLAUDE API — PHP ФУНКЦИЯ (api/chat.php) <?php
function claude_ask(string $message, string $system = ''): string {
  $key = $_ENV['ANTHROPIC_API_KEY'];
  
  $payload = json_encode([
    'model' => 'claude-sonnet-4-5',
    'max_tokens' => 1024,
    'system' => $system,
    'messages' => [['role' => 'user', 'content' => $message]],
  ]);

  $ch = curl_init('https://api.anthropic.com/v1/messages');
  curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $payload,
    CURLOPT_HTTPHEADER => [
      "x-api-key: $key",
      'anthropic-version: 2023-06-01',
      'content-type: application/json',
    ],
  ]);

  $response = json_decode(curl_exec($ch), true);
  curl_close($ch);

  return $response['content'][0]['text'] ?? 'Грешка.';
}

// Употреба
$answer = claude_ask(
  'Каква е разликата между MIG и TIG заваряване?',
  'Ти си опитен заварчик. Отговаряй на БГ.'
);
echo $answer;

PHP STREAMING — SSE (текстът се стриймва към браузъра) <?php
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
header('X-Accel-Buffering: no');

$payload = json_encode([
  'model' => 'claude-sonnet-4-5',
  'max_tokens' => 1024,
  'stream' => true,
  'messages' => [['role' => 'user', 'content' => $_POST['q']]],
]);

$ch = curl_init('https://api.anthropic.com/v1/messages');
curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($ch, $data) {
  if (str_contains($data, '"text"')) {
    $json = json_decode(trim(str_replace('data: ', '', $data)), true);
    if (isset($json['delta']['text'])) {
      echo 'data: ' . json_encode(['t' => $json['delta']['text']]) . "\n\n";
      ob_flush(); flush();
    }
  }
  return strlen($data);
});
curl_exec($ch);