MOODLE: CLI delete courses

bc.php

#!/usr/bin/php
<?php
define('CLI_SCRIPT', true);

require_once('/var/www/html/altamar/config.php');
require_once('/var/www/html/altamar/course/lib.php');

// to delete a specific course id
if (isset($argv[1])) {
        print_r("Deleting course {$argv[1]}...\n");                                                                                                                    
        $id = $argv[1];
        $course = $DB->get_record('course', array('id' => $id), '*', MUST_EXIST);
        delete_course($course);
        fix_course_sortorder(); // important!
}
else {
        print_r("Deleting all courses...\n");                                                                                                                        
        // Get array of all courses
        $courses = get_courses();
        print_r($courses);                                                                                                                                           
        print_r("Courses count: " . count($courses) . "\n");                                                                                                         
        if(count($courses) > 1) { // there is one default course of moodle                                                                                                                                   
                foreach ($courses as &$course) {
                        delete_course($course);
                        fix_course_sortorder(); // important!
                }
        }
        else { 
                print_r("\nNo course in the system!\n");                                                                                                             
        }
}
exit;
?>