moodle_block_verify_certificate/block_verify_certificate.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/>.

/**
 * Version details
 *
 * Verify certificate block
 * --------------------------
 * Verify certificate based on the unique codes displayed on issued certificates.
 * Full details of the issued certificate is displayed including profile picture.
 * Mostly cosmetic changes to the original codes from Jean-Michel Védrine.
 * Original Autor & Copyright - Jean-Michel Védrine | 2014
 *
 * @copyright           2015 onwards Manieer Chhettri | Marie Curie, UK | <manieer@gmail.com>
 * @author              Manieer Chhettri | Marie Curie, UK | <manieer@gmail.com> | 2015
 * @package             block_verify_certificate
 * @license             http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * Verify certificate block class
 *
 * @copyright 2015 onwards Manieer Chhettri | Marie Curie, UK | <manieer@gmail.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class block_verify_certificate extends block_base {

    /**
     * Sets the block title
     *
     * @return void
     */
    public function init() {
        $this->title = get_string('title', 'block_verify_certificate');
    }

    /**
     * Defines where the block can be added
     *
     * @return array
     */
    public function applicable_formats() {
        return array('all' => true);
    }

    /**
     * Creates the blocks main content
     *
     * @return string
     */
    public function get_content() {

        if ($this->content !== null) {
            return $this->content;
        }

        $this->content = new stdClass;
        $this->content->text = '<p>'.get_string('entercode', 'certificate').'</p>';
        $url = new moodle_url('/blocks/verify_certificate/index.php');
        $this->content->text .= '<form name="cert" method="post" action="'. $url . '">';

        $this->content->text .= '<input type="text" id="certcode" name="certnumber" size="20" value="" />';
        $this->content->text .= '<input type="submit" value="'.get_string('validate', 'certificate').'"/></form>';
        $this->content->footer = '';

        return $this->content;
    }

    /**
     * Controls whether the block is configurable
     *
     * @return boolean
     */
    public function instance_allow_config() {
        return false;
    }

}