Zend Framework Versions Overview: ZF1 vs ZF2 vs ZF3 vs Laminas

Misidentifying the major version is the most expensive early mistake in Zend Framework modernization. “Upgrade to Laminas” is correct for many ZF2/ZF3 apps and wrong as a one-command plan for ZF1. Use this overview as a decision tree, then open the version-specific centers.

Quick identification table

ZF1 — pre-Composer-era architecture

Front-controller MVC, application.ini, and class names with underscores. PHP upgrades collide with removed extensions and old language behavior. Laminas’s migrate tool does not treat ZF1 like ZF2/ZF3. Plan containment, Composer for your code, and strangler extraction—see ZF1 and PHP 8.

// LEGACY ZF1 class naming
class Default_Model_User extends Zend_Db_Table_Abstract {}

ZF2 — modules and DI container

Composer-supported, eventful MVC, ServiceManager factories. Migration to Laminas is documented and tooling-assisted when you meet Composer ≥1.7 and backup requirements.

// LEGACY ZF2 namespace
namespace Application\Controller;
use Zend\Mvc\Controller\AbstractActionController;

// MODERN Laminas namespace
namespace Application\Controller;
use Laminas\Mvc\Controller\AbstractActionController;

ZF3 — explicit components

Dependencies shrink to what you use. READMEs that say “ZF3” may already be mid-migration—trust composer.lock package names over marketing labels.

Laminas — continuation, not a rumor

Per official docs, Laminas is the open-source continuation / official fork after ZF was archived and abandoned. New work should target Laminas packages. Deep guide: Migrating Zend Framework to Laminas.

Practical inventory steps

1. Open composer.json / lock — zendframework vs laminas
2. Open the web entry script — Zend_Application vs Application::init
3. List modules and custom authentication/DB layers
4. Note PHP version ceiling implied by dependencies
5. Scan code with compatibility checker

History context: Zend Framework history. PHP runtime ladder: PHP 5 to modern PHP.