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✏️ Editing: before_standard_head_html_generation.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace core\hook\output;

/**
 * Allows plugins to add any elements to the page <head> html tag
 *
 * @package    core
 * @copyright  2023 Marina Glancy
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
#[\core\attribute\tags('output')]
#[\core\attribute\label('Allows plugins to add any elements to the page &lt;head&gt; html tag.')]
#[\core\attribute\hook\replaces_callbacks('before_standard_html_head')]
final class before_standard_head_html_generation {
    /**
     * Hook to allow subscribers to add HTML content to page head tag.
     *
     * @param renderer_base $renderer
     * @param string $output Initial output
     */
    public function __construct(
        /** @var \renderer_base The core_renderer instance used for the generation */
        public readonly \renderer_base $renderer,
        /** @var string The collected output */
        private string $output = '',
    ) {
    }

/**
     * Plugins implementing callback can add any HTML to the page.
     *
     * Must be a string containing valid html head content
     *
     * @param null|string $output
     */
    public function add_html(?string $output): void {
        if ($output) {
            $this->output .= $output;
        }
    }

/**
     * Returns all HTML added by the plugins
     *
     * @return string
     */
    public function get_output(): string {
        return $this->output;
    }

/**
     * Process legacy callbacks.
     *
     * Legacy callback 'before_standard_html_head' is deprecated since Moodle 4.4
     */
    public function process_legacy_callbacks(): void {
        $pluginswithfunction = get_plugins_with_function('before_standard_html_head', 'lib.php', true, true);
        foreach ($pluginswithfunction as $plugins) {
            foreach ($plugins as $function) {
                $output = $function();
                $this->add_html((string)$output);
            }
        }
    }
}

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