Zend Framework 1 - Inject params into action methods

YourAbstractControllerClass.php

<?php

/**
 * Class YourAbstractControllerClass
 * 
 * Overload Zend_Controller_Action to inject params into action methods
 * 
 */
abstract class YourAbstractControllerClass extends Zend_Controller_Action
{

    /**
     * Dispatch the requested action
     *
     * @param string $action Method name of action
     * @return void
     */
    public function dispatch($action)
    {
        // Notify helpers of action preDispatch state
        $this->_helper->notifyPreDispatch();

        $this->preDispatch();
        if ($this->getRequest()->isDispatched()) {
            if (null === $this->_classMethods) {
                $this->_classMethods = get_class_methods($this);
            }

            // If pre-dispatch hooks introduced a redirect then stop dispatch
            // @see ZF-7496
            if (!($this->getResponse()->isRedirect())) {
                // preDispatch() didn't change the action, so we can continue
                if ($this->getInvokeArg('useCaseSensitiveActions') || in_array($action, $this->_classMethods)) {
                    if ($this->getInvokeArg('useCaseSensitiveActions')) {
                        trigger_error('Using case sensitive actions without word separators is deprecated; please do not rely on this "feature"');
                    }

                    /// MODIFICATION - START //
                    // Reflection on action method
                    $method = new ReflectionMethod($this, $action);

                    $params = [];
                    foreach ($method->getParameters() as $p) {
                        /** @var ReflectionParameter $p */
                        $params[] = $this->hasParam($name = $p->getName()) ? $this->getParam($name) : $p->getDefaultValue();
                    }

                    // calling the method
                    call_user_func_array([$this, $action], $params);

                    /// MODIFICATION - END //
                    
                } else {
                    $this->__call($action, array());
                }
            }
            $this->postDispatch();
        }

        // whats actually important here is that this action controller is
        // shutting down, regardless of dispatching; notify the helpers of this
        // state
        $this->_helper->notifyPostDispatch();
    }
}