For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
Book a demoLog inStart for free
  • Overview
    • Introduction
    • How it works
    • Quickstart
    • Customer showcase
  • Working with SDKs
    • Project structure
    • Adding custom code
    • Migrating to Replay
    • Capabilities
  • Generators
      • Generating an SDK
      • Publishing to Packagist
      • Configuration
      • Adding custom code
      • Changelog
      • Customer showcase
  • Reference
    • generators.yml
Checking status...
SOC2Soc 2 Type II
© 2026 Fern • Birch Solutions, Inc., a Postman company

Documentation

SDKsDocsAsk FernCLI Reference

API Definitions

OpenAPIAsyncAPIOpenRPCgRPC

Resources

BlogSupportPricing

Company

Brand KitPrivacy PolicyTerms of Service
LogoLogo
Book a demoLog inStart for free
GeneratorsPHP

Changelog

March 12, 2026
March 12, 2026

2.2.0

(feat): Add omitFernHeaders configuration option. When enabled, Fern platform headers (X-Fern-Language, X-Fern-SDK-Name, X-Fern-SDK-Version, User-Agent) are omitted from generated SDK requests.

2.1.12

(fix): Fix WireMock datetime mismatch in wire tests. The mock-utils package generates datetime query parameter values with milliseconds (e.g., 2022-01-02T00:00:00.000Z) via Date.toISOString(), but PHP’s DateTimeInterface::RFC3339 format omits fractional seconds (e.g., 2022-01-02T00:00:00Z). Since WireMock’s equalTo is an exact-match, the stubs never fired. Now strips zero milliseconds from WireMock datetime query parameter values to match the PHP SDK’s serialization format.

Was this page helpful?
Edit this page
Previous

March 17, 2026

Next

March 11, 2026