How to Build Your Own PHP GEO Optimization Library

What You'll Need

• PHP 7.4 or higher - Modern PHP with typed properties
• Composer - For dependency management
• Git - Version control for your project
• Basic PHP OOP knowledge - Classes, interfaces, namespaces
• Text editor or IDE - VS Code, PhpStorm, or your preference

Why Build Your Own GEO Library?

Step 1: Initialize Your Project

# Create project directory
mkdir php-geo-optimizer
cd php-geo-optimizer

# Initialize Git repository
git init

# Create basic structure
mkdir src tests docs examples
mkdir src/{LLMSTxt,StructuredData,ContentOptimizer,Templates,Exceptions}
mkdir src/LLMSTxt/Templates
mkdir src/StructuredData/Types
mkdir src/Templates/Components

Step 2: Create composer.json

composer init

Follow the prompts to create your composer.json. Here's the complete configuration:

{
    "name": "yourname/php-geo-optimizer",
    "description": "A comprehensive PHP library for Generative Engine Optimization (GEO)",
    "type": "library",
    "keywords": ["geo", "seo", "ai", "llm", "optimization", "schema", "structured-data"],
    "license": "MIT",
    "authors": [
        {
            "name": "Your Name",
            "email": "your.email@example.com"
        }
    ],
    "require": {
        "php": ">=7.4",
        "ext-json": "*",
        "spatie/schema-org": "^3.0",
        "twig/twig": "^3.0"
    },
    "require-dev": {
        "phpunit/phpunit": "^9.0",
        "phpstan/phpstan": "^1.0",
        "squizlabs/php_codesniffer": "^3.0"
    },
    "autoload": {
        "psr-4": {
            "GEOOptimizer\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "GEOOptimizer\\Tests\\": "tests/"
        }
    }
}

Step 3: Install Dependencies

composer install
composer require spatie/schema-org twig/twig
composer require --dev phpunit/phpunit phpstan/phpstan

Library Structure Overview

Design Principles

Step 1: Create the Main Class

Start with your main GEOOptimizer.php class. This serves as the public API for your library:

<?php
namespace GEOOptimizer;

use GEOOptimizer\LLMSTxt\Generator as LLMSTxtGenerator;
use GEOOptimizer\StructuredData\SchemaGenerator;
use GEOOptimizer\Exceptions\GEOException;

class GEOOptimizer
{
    private $config;
    private $llmsTxtGenerator;
    private $schemaGenerator;

    public function __construct(array $config = [])
    {
        $this->config = array_merge($this->getDefaultConfig(), $config);
        $this->initializeComponents();
    }

    public function optimize(array $businessData): array
    {
        $this->validateBusinessData($businessData);

        return [
            'llms_txt' => $this->generateLLMSTxt($businessData),
            'structured_data' => $this->generateStructuredData($businessData),
            'meta_optimization' => $this->optimizeMeta($businessData),
            'components' => $this->generateComponents($businessData)
        ];
    }

    public function generateLLMSTxt(array $businessData): string
    {
        return $this->llmsTxtGenerator->generate($businessData);
    }

    public function generateStructuredData(array $businessData, string $type = 'LocalBusiness'): string
    {
        return $this->schemaGenerator->generate($type, $businessData);
    }

    private function validateBusinessData(array $businessData): void
    {
        $required = ['name', 'description', 'industry'];
        
        foreach ($required as $field) {
            if (!isset($businessData[$field]) || empty($businessData[$field])) {
                throw new GEOException("Required field '{$field}' is missing or empty");
            }
        }
    }

    private function initializeComponents(): void
    {
        $this->llmsTxtGenerator = new LLMSTxtGenerator($this->config);
        $this->schemaGenerator = new SchemaGenerator($this->config);
    }

    private function getDefaultConfig(): array
    {
        return [
            'templates_path' => __DIR__ . '/Templates',
            'cache_enabled' => true,
            'validation_strict' => true
        ];
    }
}

Step 2: Build the LLMs.txt Generator

Create src/LLMSTxt/Generator.php:

<?php
namespace GEOOptimizer\LLMSTxt;

use GEOOptimizer\Exceptions\ValidationException;
use Twig\Environment;
use Twig\Loader\FilesystemLoader;

class Generator
{
    private $config;
    private $twig;

    public function __construct(array $config = [])
    {
        $this->config = $config;
        $this->initializeTwig();
    }

    public function generate(array $businessData, string $template = 'business'): string
    {
        $this->validateBusinessData($businessData);
        
        $templateData = $this->prepareTemplateData($businessData);
        
        return $this->twig->render("{$template}.txt", $templateData);
    }

    public function save(array $businessData, string $path = 'public/llms.txt', string $template = 'business'): bool
    {
        $content = $this->generate($businessData, $template);
        
        $directory = dirname($path);
        if (!is_dir($directory)) {
            mkdir($directory, 0755, true);
        }
        
        return file_put_contents($path, $content) !== false;
    }

    private function validateBusinessData(array $businessData): void
    {
        $required = [
            'name' => 'Business name is required',
            'description' => 'Business description is required',
            'industry' => 'Industry classification is required'
        ];

        foreach ($required as $field => $message) {
            if (!isset($businessData[$field]) || empty(trim($businessData[$field]))) {
                throw new ValidationException($message);
            }
        }
    }

    private function prepareTemplateData(array $businessData): array
    {
        return [
            'business_name' => $businessData['name'],
            'description' => $businessData['description'],
            'industry' => $businessData['industry'],
            'founded' => $businessData['founded'] ?? '',
            'location' => $businessData['location'] ?? '',
            'services' => $this->formatList($businessData['services'] ?? []),
            'specialties' => $this->formatList($businessData['specialties'] ?? []),
            'certifications' => $this->formatList($businessData['certifications'] ?? []),
            'phone' => $businessData['phone'] ?? '',
            'email' => $businessData['email'] ?? '',
            'website' => $businessData['website'] ?? '',
            'generated_date' => date('Y-m-d')
        ];
    }

    private function formatList(array $items): string
    {
        return implode(', ', array_filter($items));
    }

    private function initializeTwig(): void
    {
        $templatePath = $this->config['templates_path'] ?? __DIR__ . '/Templates';
        $loader = new FilesystemLoader($templatePath);
        $this->twig = new Environment($loader, [
            'cache' => $this->config['cache_enabled'] ?? false,
            'auto_reload' => true
        ]);
    }
}

Create Template Files

Create template files in src/LLMSTxt/Templates/. Here's the basic business template:

business.txt:

# {{ business_name }} - AI Information File
# Generated: {{ generated_date }}

# Business Overview
Company: {{ business_name }}
Industry: {{ industry }}
Description: {{ description }}
{% if location %}Location: {{ location }}{% endif %}
{% if founded %}Founded: {{ founded }}{% endif %}

# Services & Expertise
{% if services %}Primary Services: {{ services }}{% endif %}
{% if specialties %}Specialties: {{ specialties }}{% endif %}

# Authority & Credentials
{% if certifications %}Certifications: {{ certifications }}{% endif %}
{% if years_experience %}Years in Business: {{ years_experience }}{% endif %}

# Contact Information
{% if website %}Website: {{ website }}{% endif %}
{% if phone %}Phone: {{ phone }}{% endif %}
{% if email %}Email: {{ email }}{% endif %}

Step 3: Implement Schema Generator

Build the structured data generator using the Spatie library:

<?php
namespace GEOOptimizer\StructuredData;

use Spatie\SchemaOrg\Schema;
use GEOOptimizer\Exceptions\ValidationException;

class SchemaGenerator
{
    private $config;

    public function __construct(array $config = [])
    {
        $this->config = $config;
    }

    public function generate(string $type, array $data): string
    {
        $method = 'generate' . $type;
        
        if (!method_exists($this, $method)) {
            throw new ValidationException("Generator method not found for type: {$type}");
        }

        $schema = $this->$method($data);
        
        return $schema->toScript();
    }

    private function generateLocalBusiness(array $data)
    {
        $business = Schema::localBusiness()
            ->name($data['name'])
            ->description($data['description']);

        // Add address if provided
        if (isset($data['address'])) {
            $address = Schema::postalAddress();
            
            if (isset($data['address']['street'])) {
                $address->streetAddress($data['address']['street']);
            }
            if (isset($data['address']['city'])) {
                $address->addressLocality($data['address']['city']);
            }
            if (isset($data['address']['state'])) {
                $address->addressRegion($data['address']['state']);
            }
            if (isset($data['address']['zip'])) {
                $address->postalCode($data['address']['zip']);
            }
            
            $business->address($address);
        }

        // Add contact information
        if (isset($data['phone'])) {
            $business->telephone($data['phone']);
        }
        if (isset($data['email'])) {
            $business->email($data['email']);
        }
        if (isset($data['website'])) {
            $business->url($data['website']);
        }

        // Add business hours
        if (isset($data['hours'])) {
            $openingHours = [];
            foreach ($data['hours'] as $day => $hours) {
                if ($hours !== 'closed') {
                    $openingHours[] = $day . ' ' . $hours;
                }
            }
            if (!empty($openingHours)) {
                $business->openingHours($openingHours);
            }
        }

        return $business;
    }

    private function generateFAQ(array $data)
    {
        $faqPage = Schema::fAQPage();
        $questions = [];

        foreach ($data['faqs'] as $faq) {
            $question = Schema::question()
                ->name($faq['question'])
                ->acceptedAnswer(
                    Schema::answer()->text($faq['answer'])
                );
            $questions[] = $question;
        }

        $faqPage->mainEntity($questions);

        return $faqPage;
    }
}

Step 1: Set Up PHPUnit

Create phpunit.xml:

<?xml version="1.0" encoding="UTF-8"?>
<phpunit bootstrap="vendor/autoload.php"
         colors="true"
         testdox="true">
    <testsuites>
        <testsuite name="GEO Optimizer Tests">
            <directory>tests</directory>
        </testsuite>
    </testsuites>
</phpunit>

Step 2: Write Unit Tests

Create tests/GEOOptimizerTest.php:

<?php

use PHPUnit\Framework\TestCase;
use GEOOptimizer\GEOOptimizer;

class GEOOptimizerTest extends TestCase
{
    public function testCanInstantiate()
    {
        $geo = new GEOOptimizer();
        $this->assertInstanceOf(GEOOptimizer::class, $geo);
    }
    
    public function testOptimizeReturnsArray()
    {
        $geo = new GEOOptimizer();
        $businessData = [
            'name' => 'Test Business',
            'description' => 'Test Description',
            'industry' => 'Testing'
        ];
        
        $result = $geo->optimize($businessData);
        $this->assertIsArray($result);
        $this->assertArrayHasKey('llms_txt', $result);
        $this->assertArrayHasKey('structured_data', $result);
    }

    public function testRequiredFieldsValidation()
    {
        $geo = new GEOOptimizer();
        
        $this->expectException(\GEOOptimizer\Exceptions\GEOException::class);
        $geo->optimize(['name' => 'Test']); // Missing required fields
    }
}

// Test individual components
use GEOOptimizer\LLMSTxt\Generator;

class LLMSTxtGeneratorTest extends TestCase
{
    public function testGeneratesValidContent()
    {
        $generator = new Generator();
        $businessData = [
            'name' => 'Test Business',
            'description' => 'Test Description',
            'industry' => 'Testing'
        ];
        
        $content = $generator->generate($businessData);
        $this->assertStringContainsString('Test Business', $content);
        $this->assertStringContainsString('# Business Overview', $content);
    }
}

Step 3: Run Tests

vendor/bin/phpunit

Submit to Packagist

1. Create account on packagist.org
2. Push to GitHub - Your repository must be public
3. Submit your GitHub repository URL to Packagist
4. Set up auto-updating webhook in GitHub settings

# Tag your first release
git tag v1.0.0
git push origin v1.0.0

Create Documentation

Create a comprehensive README.md:

# PHP GEO Optimizer

A comprehensive PHP library for Generative Engine Optimization (GEO).

## Installation

```bash
composer require yourname/php-geo-optimizer
```

## Quick Start

```php
use GEOOptimizer\GEOOptimizer;

$geo = new GEOOptimizer();
$result = $geo->optimize([
    'name' => 'Your Business',
    'description' => 'What you do',
    'industry' => 'Your industry'
]);

// Generate llms.txt
file_put_contents('public/llms.txt', $result['llms_txt']);

// Add structured data to HTML head
echo $result['structured_data'];
```

## Features

- ✅ LLMs.txt generation with industry templates
- ✅ Schema.org structured data generation
- ✅ Content analysis and optimization
- ✅ Bootstrap component generation
- ✅ WordPress plugin integration

## Documentation

See our [complete documentation](link-to-docs) for detailed usage examples.

WordPress Plugin Integration

Create a WordPress plugin wrapper for your library:

<?php
/**
 * Plugin Name: GEO Optimizer
 * Description: Optimize your WordPress site for AI-powered search engines
 * Version: 1.0.0
 */

if (!defined('ABSPATH')) {
    exit;
}

// Include Composer autoloader
require_once plugin_dir_path(__FILE__) . 'vendor/autoload.php';

class GEOOptimizerWordPress
{
    private $geoOptimizer;

    public function __construct()
    {
        add_action('init', [$this, 'init']);
        add_action('admin_menu', [$this, 'addAdminMenu']);
        add_action('wp_head', [$this, 'addStructuredData']);
        
        // Custom endpoint for llms.txt
        add_action('init', [$this, 'addLLMSTxtEndpoint']);
        add_action('template_redirect', [$this, 'handleLLMSTxtRequest']);
    }

    public function init()
    {
        if (class_exists('GEOOptimizer\\GEOOptimizer')) {
            $this->geoOptimizer = new GEOOptimizer\GEOOptimizer();
        }
    }

    public function addAdminMenu()
    {
        add_options_page(
            'GEO Optimizer Settings',
            'GEO Optimizer',
            'manage_options',
            'geo-optimizer',
            [$this, 'adminPage']
        );
    }

    public function addStructuredData()
    {
        if (!$this->geoOptimizer) return;

        $options = get_option('geo_optimizer_options', []);
        if (empty($options['business_name'])) return;

        $structuredData = $this->geoOptimizer->generateStructuredData($options);
        echo $structuredData;
    }

    public function addLLMSTxtEndpoint()
    {
        add_rewrite_rule('^llms\.txt, 'index.php?llms_txt=1', 'top');
    }

    public function handleLLMSTxtRequest()
    {
        if (get_query_var('llms_txt')) {
            header('Content-Type: text/plain');
            echo $this->generateLLMSTxtContent();
            exit;
        }
    }

    private function generateLLMSTxtContent()
    {
        if (!$this->geoOptimizer) {
            return "# Please configure GEO Optimizer in WordPress admin";
        }

        $options = get_option('geo_optimizer_options', []);
        return $this->geoOptimizer->generateLLMSTxt($options);
    }
}

new GEOOptimizerWordPress();

Analytics Integration

Add citation tracking capabilities:

<?php
namespace GEOOptimizer\Analytics;

class CitationTracker
{
    public function trackDomain(string $domain): array
    {
        return [
            'domain' => $domain,
            'total_citations' => $this->countCitations($domain),
            'ai_platforms' => $this->getAIPlatformCitations($domain),
            'trending_topics' => $this->getTrendingTopics($domain)
        ];
    }

    public function getCitationHistory(string $domain, int $days = 30): array
    {
        // Implementation for tracking citation history
        return $this->processCitationData($domain, $days);
    }

    private function countCitations(string $domain): int
    {
        // Simulate citation counting
        // In production, this would integrate with actual APIs
        return rand(10, 50);
    }

    private function getAIPlatformCitations(string $domain): array
    {
        return [
            'ChatGPT' => rand(5, 15),
            'Claude' => rand(3, 12),
            'Perplexity' => rand(2, 8),
            'Google AI' => rand(4, 10)
        ];
    }
}