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Security improvements

  • Added #[SensitiveParameter] attributes to methods handling sensitive data (passwords, tokens, private keys) to prevent them from appearing in stack traces and error logs.

Breaking changes

  • The SDK supports only actively supported PHP versions. As a result, support for PHP < 8.3 has been dropped; supported versions are 8.3, 8.4, and 8.5.
  • Firebase Dynamic Links was shut down on August 25th, 2025 and has been removed from the SDK.
  • Deprecated classes, methods and class constants have been removed.
  • Method arguments are now fully type-hinted
  • Type declarations have been simplified to reduce runtime overhead (e.g., Stringable|string to string).
  • The transitional Kreait\Firebase\Contract\Transitional\FederatedUserFetcher::getUserByProviderUid() method has been moved into the Kreait\Firebase\Contract\Auth interface
  • Realtime Database objects considered value objects have been made final and readonly
  • psr/log has been moved from runtime dependencies to development dependencies
  • Kreait\Firebase\Contract\Messaging::BATCH_MESSAGE_LIMIT constant has been removed
  • Exception codes are no longer preserved when wrapping exceptions
  • Kreait\Firebase\Messaging\CloudMessage builder methods have been renamed to follow the with* pattern: toToken() -> withToken(), toTopic() -> withTopic(), toCondition() -> withCondition(). The old methods are deprecated but still available as aliases.

See UPGRADE-8.0 for more details on the changes between 7.x and 8.0.

7.x Changelog

https://github.com/kreait/firebase-php/blob/7.24.0/CHANGELOG.md

[!IMPORTANT] Support the project: This SDK is downloaded 1M+ times monthly and powers thousands of applications. If it saves you or your team time, please consider sponsoring its development.

Source: README.md, updated 2026-01-08