WHM Getting Error – Sudomain Module (API) – CPanel

To create a subdomain via cpanel API you can try below code :-

    require_once 'xmlapi.php';
    $api2args = array(
        'domain' => 'subdomain',   // name of the subdomain to be created
        'rootdomain' => 'example.com',  // main domain under which sub 
                                     domain needs to be created
        'dir'  => '/public_html/directory_name',  // directory to generate 
                                           for this subdomain
        'disallowdot'           => '1'
    );

    $result = $xmlapi->api2_query($cpanel['username'], 'SubDomain', 
              'addsubdomain', $api2args);