BOOK DESCRIPTION Artificial Intelligence is rapidly changing how modern software is built, and AI agents are leading that transformation. Instead of creating applications that simply respond to user input, developers are now building intelligent systems that can reason, use tools, retrieve knowledge, automate workflows, collaborate with other agents, and perform complex business tasks with minimal human intervention. Start with AI Agents in PHP is a practical, project-driven guide that teaches you how to design, build, and deploy production-ready AI agents using PHP. Whether you're an experienced PHP developer or you're exploring AI-powered application development for the first time, this book provides a structured path from the fundamentals of intelligent agents to building scalable, enterprise-grade AI systems. You'll learn how to connect PHP applications to Large Language Models (LLMs), engineer reliable prompts, implement tool calling, build memory systems, integrate Retrieval-Augmented Generation (RAG), develop multi-agent architectures, automate business workflows, and deploy secure, scalable AI applications ready for real-world use. Throughout the book, you'll work through practical architectures and real business scenarios, including customer support assistants, CRM and sales automation, intelligent document processing, email automation, enterprise operations, and complete multi-agent platforms. Along the way, you'll also learn the software engineering practices needed to build AI systems that are maintainable, observable, secure, cost-efficient, and production-ready. Inside You'll Discover: - AI agent fundamentals and modern agent architectures - Connecting PHP applications to Large Language Models (LLMs) - Prompt engineering techniques for reliable AI behavior - Tool calling and external API integration - Building reusable AI agent frameworks in PHP - Short-term and long-term memory systems - Retrieval-Augmented Generation (RAG) with embeddings and vector search - Multi-agent collaboration and workflow orchestration - AI-powered business automation and enterprise applications - Customer support, CRM, email, and document processing agents - Security, guardrails, monitoring, logging, and observability - Performance optimization, caching, rate limiting, and cost management - Deployment strategies, scalability, and production-ready architecture Rather than focusing on theory alone, this book emphasizes practical engineering principles, real-world design patterns, and maintainable software architecture. Every chapter builds toward creating intelligent PHP applications that solve meaningful business problems and are ready for deployment in modern production environments. If you're ready to move beyond traditional web development and start building the next generation of AI-powered software with PHP, this book provides the knowledge, architecture, and practical guidance to help you get there.