/root/Elgg/engine/classes/Elgg/FormsService.php

Convenience function for generating a form from a view in a standard location.This function assumes that the body of the form is located at "forms/$action" and sets the action by default to "action/$action". Automatically wraps the forms/$action view with a <form> tag and inserts the anti-csrf security tokens.

This automatically appends elgg-form-action-name to the form's class. It replaces any slashes with dashes (blog/save becomes elgg-form-blog-save)

echo elgg_view_form('login');

This would assume a "login" form body to be at "forms/login" and would set the action of the form to "http://yoursite.com/action/login".

If elgg_view('forms/login') is: <input type="text" name="username"> <input type="password" name="password">

Then elgg_view_form('login') generates: <form action="http://yoursite.com/action/login" method="post"> ...security tokens... <input type="text" name="username"> <input type="password" name="password"> </form>

Parameters

string	$action	The name of the action. An action name does not include the leading "action/". For example, "login" is an action name.
array	$form_vars	$vars passed to the "input/form" view
array	$body_vars	$vars passed to the "forms/<action>" view

Returns

string The complete form

<?php

namespace Elgg;

class FormsService {

    private $views;

    private $logger;

    private $rendering;

    private $footer = '';

    public function __construct(ViewsService $views, Logger $logger) {
        $this->views = $views;
        $this->logger = $logger;
    }

    public function render($action, $form_vars = array(), $body_vars = array()) {

        $defaults = array(
            'action' => elgg_normalize_url("action/$action"),
        );

        // append elgg-form class to any class options set
        $form_vars['class'] = (array) elgg_extract('class', $form_vars, []);
        $form_vars['class'][] = 'elgg-form-' . preg_replace('/[^a-z0-9]/i', '-', $action);

        $form_vars = array_merge($defaults, $form_vars);

        $form_vars['action_name'] = $action;
        
        if (!isset($form_vars['body'])) {
            $this->rendering = true;
            $this->footer = '';

            // Render form body
            $body = $this->views->renderView("forms/$action", $body_vars);

            if (!empty($body)) {
                // Grab the footer if one was set during form rendering
                $body .= $this->views->renderView('elements/forms/footer', [
                    'footer' => $this->getFooter(),
                    'action_name' => $action,
                ]);
            }
            
            $this->rendering = false;

            $form_vars['body'] = $body;
        }

        return elgg_view('input/form', $form_vars);
    }

    public function setFooter($footer = '') {

        if (!$this->rendering) {
            $this->logger->error('Form footer can only be set and retrieved during form rendering, '
                    . 'anywhere in elgg_view_form() call stack (e.g. form view, extending views, or view hooks)');
            return false;
        }

        $this->footer = $footer;
        return true;
    }

    public function getFooter() {
        if (!$this->rendering) {
            $this->logger->error('Form footer can only be set and retrieved during form rendering, '
                    . 'anywhere in elgg_view_form() call stack (e.g. form view, extending views, or view hooks)');
            return false;
        }

        return $this->footer;
    }

}