docs: add PHP getting started guide

[KMKoushik]

Summary

• add a PHP getting-started guide that uses the REST API for sending emails and managing contacts
• document setup with Guzzle, email sending, contact operations, and basic error handling
• surface the PHP guide in the Getting Started navigation

Issues

• None

Screenshots

• Not applicable

Migrations

• None

Verification

• Not run (docs-only change)

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Codex Task

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Summary by cubic

Adds a PHP getting started guide that uses the REST API via Guzzle to send emails and manage contacts, and surfaces it in the Getting Started navigation.

• New Features
  • Setup with Composer/Guzzle and a reusable client.
  • Examples for sending emails and creating/updating contacts.
  • Basic error handling patterns.
  • Added “PHP (API)” to the Getting Started nav.

^{Written for commit 45c89cbc3464ec7e68cc3ae8a6d066df48675108. Summary will update automatically on new commits.}

Summary by CodeRabbit

• Documentation
  • Added PHP Getting Started guide covering REST API integration with code examples for email sending and contact management
  • Updated documentation navigation to include the new PHP guide

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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Deploying usesend with    Cloudflare Pages

Latest commit:	45c89cb
Status:	✅  Deploy successful!
Preview URL:	https://dc0e6045.usesend.pages.dev
Branch Preview URL:	https://codex-create-getting-started.usesend.pages.dev

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Project	Deployment	Preview	Comments	Updated (UTC)
unsend-marketing	Ready	Preview	Comment	Nov 29, 2025 4:42am

[coderabbitai[bot]]

Walkthrough

This pull request adds PHP documentation to the Getting Started section. It includes a new page in the documentation navigation (docs.json) and introduces a comprehensive PHP guide (get-started/php.mdx) for using the useSend REST API. The guide covers prerequisites, Guzzle HTTP client installation and configuration, practical examples for sending emails and managing contacts using POST and PATCH requests, error handling with try/catch blocks, and support notes for self-hosted deployments. Custom header forwarding is also documented.

Pre-merge checks

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add PHP getting started guide' clearly and concisely describes the main change: adding a PHP getting-started guide to the documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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