Moodle api list all cohorts - api

Question

Im looking to get all cohorts, i can get the info if i have the id but i want all the cohorts names and ids. Please let me know if theres a way to do this. Thanks in advance
$functionname = 'core_cohort_get_cohorts';
$cohortIDS = array( '1' );
$data_string = http_build_query(array('cohortids' => $cohortIDS));
$utoken = 'mytoken';
$adduser = 'yoururl/webservice/rest/server.php? wstoken='.$utoken.'&wsfunction='.$functionname.'&moodlewsrestformat=json';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$adduser);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$server_output = curl_exec ($ch);
curl_close ($ch);
echo '<pre>';
print_r(json_decode($server_output));
echo '</pre>';

Answer 1

You could add more method to core_cohort to get all cohort as the following:
In the cohort/externallib.php, add more method:
public static function get_all_cohorts(){
global $DB;
$cohortids = $DB->get_records('cohort', null, null, 'id');
$arrids = array();
foreach($cohortids as $id){
$arrids[] = $id->id;
}
return (new core_cohort_external())->get_cohorts($arrids);
}
In addition, you have to register this webservice called 'core_cohort_get_all_cohorts' to call this webservice from outside. Please tell me if you have further question.