Не запускается агент

function dbgLog($data, string $suffix = '_1')
{
    if (
        !empty($suffix)
        &&
        preg_match('![^-0-9a-zA-Z_]+!', $suffix)
    ) {
        $suffix = '';
    }
 
    $fileName = $_SERVER["DOCUMENT_ROOT"] . "/" . "logs/dbg-" . date("Y-m-d_H_i_s") . $suffix . ".txt";
    $r = fopen($fileName, 'a');
    fwrite($r, PHP_EOL);
    fwrite($r, date('Y-m-d H:i:s') . PHP_EOL);
    fwrite($r, print_r($data, 1));
    fwrite($r, PHP_EOL);
    fclose($r);
}

function testAgent(){
    dbgLog('test agent','__test_agent__');
    return "testAgent();";
}