webkader

function isValidInteger($integer)
{
    if (filter_var($integer, FILTER_VALIDATE_INT) && $integer > 0) {
        return true;
    } else {
        return false;
    }
}

webkader

function isValidFloat($float)
{
    if (filter_var($float, FILTER_VALIDATE_FLOAT)) {
        return true;
    } else {
        return false;
    }
}

webkader

function isValidString($string)
{
    if (empty($string)) {
        return false;
    }

    if (preg_match("/[\||\'|\<|\>|\[|\]|\"|\!|\?|\$|\@|\/|\\\|\&\~\*\{\+]/", $string)) {
        return false;
    } else {
        return true;

webkader

function isValidUrl($url)
{
    if (empty($url)) {
        return false;
    }

    // only ASCII URL
    if (filter_var($url, FILTER_VALIDATE_URL)) {
        return true;
    } else {

webkader

function isValidEmail($email)
{
    if (empty($email)) {
        return false;
    }

    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
        if (@count(explode("@", $email)) != 2) {
            return false;
        } else {

webkader

function isValidDate($date, $format = "d-m-Y H:i:s")
{
    //since php 5.3
    $parsedate = date_parse_from_format($format, $date);
    $datetmp = mktime($parsedate['hour'], $parsedate['minute'], $parsedate['second'], $parsedate['month'], $parsedate['day'], $parsedate['year']);

    return (strtotime($date) == $datetmp) ? true : false;
}

webkader

function isValidTax($vatid)
{
    $vatid = str_replace(array(
        ' ',
        '.',
        '-',
        ',',
        ', '), '', trim($vatid));
    $prefix = substr($vatid, 0, 2);
    $number = substr($vatid, 2);

webkader

// look into http://php.net/manual/en/language.types.float.php
function compareFloatValues($a, $b, $operator = '==')
{

    // This value is known as the machine epsilon, or unit roundoff, and is the smallest acceptable difference in calculations.
    $epsilon = 0.00001;

    // make equal to 5 digits of precision
    $a = (float)$a;
    $b = (float)$b;

webkader

	/**
	 * isNetworkAvailable() TRUE wenn eine Datenverbindung vorhanden ist
	 * 
	 * @param mixed activity
	 * @return
	 */
	public static boolean isNetworkAvailable(Activity activity) {
		ConnectivityManager connectivity = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			return false;

webkader

	/**
	 * doAlert() für Warn- und Rückfragedialoge
	 * 
	 * @param mixed context
	 * @param mixed title
	 * @param mixed message
	 * @param boolean status
	 */
	@SuppressWarnings("deprecation")
	public void doAlert(Context context, String title, String message, Boolean status) {