Laravel

POSTHOG_API_KEY=<ph_project_token>
POSTHOG_HOST=https://us.i.posthog.com

'posthog' => [
    'api_key' => env('POSTHOG_API_KEY'),
    'host' => env('POSTHOG_HOST', 'https://us.i.posthog.com'),
],

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use PostHog\PostHog;

class AppServiceProvider extends ServiceProvider
{
    public function boot(): void
    {
        if (! config('services.posthog.api_key')) {
            return;
        }

        PostHog::init(
            config('services.posthog.api_key'),
            [
                'host' => config('services.posthog.host'),
            ]
        );
    }
}

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use PostHog\PostHog;
use Symfony\Component\HttpFoundation\Response;

final class PostHogRequestContext
{
    public function handle(Request $request, Closure $next): Response
    {
        if (! config('services.posthog.api_key')) {
            return $next($request);
        }

        $context = PostHog::contextFromHeaders($request->headers->all());

        $context['properties'] = array_merge(
            $context['properties'] ?? [],
            array_filter([
                '$current_url' => $request->fullUrl(),
                '$request_method' => $request->method(),
                '$request_path' => $request->getPathInfo(),
                '$user_agent' => $request->userAgent(),
                '$ip' => $request->ip(),
            ], static fn ($value): bool => $value !== null && $value !== '')
        );

        return PostHog::withContext(
            $context,
            static fn (): Response => $next($request),
            ['fresh' => true]
        );
    }
}

use Illuminate\Foundation\Configuration\Exceptions;
use PostHog\PostHog;
use Throwable;

->withExceptions(function (Exceptions $exceptions): void {
    $exceptions->report(function (Throwable $e): void {
        if (! config('services.posthog.api_key')) {
            return;
        }

        PostHog::captureException(
            $e,
            auth()->id() !== null ? (string) auth()->id() : null,
            [
                '$current_url' => request()->fullUrl(),
                '$request_method' => request()->method(),
            ]
        );
    });
})

PostHog::init(
    '<ph_project_token>',
    [
        'host' => config('services.posthog.host'),
        'batch_size' => 1,
    ]
);