Get Moodle courses by category ID

moodle_course_utils.php

#! /usr/bin/php
<?php
define('CLI_SCRIPT', true);
/*
 Author: Trinh Nguyen
 Last update: August 1st, 2016
 
 NOTES:
 * Place this file inside a folder inside moodle root. E.g.g: /var/www/moodle/your-script/moodle_course_utils.php
*/


require_once("../config.php");
require_once($CFG->dirroot. '/course/lib.php');
require_once($CFG->libdir. '/coursecatlib.php');

$catid = 13; // Category id

$cat = coursecat::get($catid);
$children_courses = $cat->get_courses();                                                                                                               

foreach($children_courses as $course) {
        echo "### Course: " . $course->id . "\n";
}


exit(0);
?>