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<?php |
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namespace GuzzleHttp\Handler; |
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use GuzzleHttp\Psr7\Response; |
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use GuzzleHttp\Utils; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\StreamInterface; |
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/** |
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* Represents a cURL easy handle and the data it populates. |
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* |
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* @internal |
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*/ |
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final class EasyHandle |
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{ |
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/** |
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* @var resource|\CurlHandle cURL resource |
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*/ |
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public $handle; |
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/** |
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* @var StreamInterface Where data is being written |
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*/ |
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public $sink; |
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/** |
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* @var array Received HTTP headers so far |
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*/ |
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public $headers = []; |
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/** |
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* @var ResponseInterface|null Received response (if any) |
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*/ |
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public $response; |
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/** |
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* @var RequestInterface Request being sent |
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*/ |
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public $request; |
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/** |
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* @var array Request options |
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*/ |
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public $options = []; |
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/** |
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* @var int cURL error number (if any) |
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*/ |
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public $errno = 0; |
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/** |
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* @var \Throwable|null Exception during on_headers (if any) |
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*/ |
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public $onHeadersException; |
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/** |
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* @var \Exception|null Exception during createResponse (if any) |
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*/ |
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public $createResponseException; |
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/** |
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* Attach a response to the easy handle based on the received headers. |
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* |
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* @throws \RuntimeException if no headers have been received or the first |
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* header line is invalid. |
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*/ |
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public function createResponse(): void |
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{ |
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[$ver, $status, $reason, $headers] = HeaderProcessor::parseHeaders($this->headers); |
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$normalizedKeys = Utils::normalizeHeaderKeys($headers); |
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if (!empty($this->options['decode_content']) && isset($normalizedKeys['content-encoding'])) { |
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$headers['x-encoded-content-encoding'] = $headers[$normalizedKeys['content-encoding']]; |
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unset($headers[$normalizedKeys['content-encoding']]); |
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if (isset($normalizedKeys['content-length'])) { |
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$headers['x-encoded-content-length'] = $headers[$normalizedKeys['content-length']]; |
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$bodyLength = (int) $this->sink->getSize(); |
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if ($bodyLength) { |
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$headers[$normalizedKeys['content-length']] = $bodyLength; |
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} else { |
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unset($headers[$normalizedKeys['content-length']]); |
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} |
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} |
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} |
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// Attach a response to the easy handle with the parsed headers. |
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$this->response = new Response( |
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$status, |
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$headers, |
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$this->sink, |
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$ver, |
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$reason |
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); |
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} |
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/** |
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* @param string $name |
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* |
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* @return void |
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* |
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* @throws \BadMethodCallException |
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*/ |
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public function __get($name) |
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{ |
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$msg = $name === 'handle' ? 'The EasyHandle has been released' : 'Invalid property: ' . $name; |
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throw new \BadMethodCallException($msg); |
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} |
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} |
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This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$x
would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.