REQUEST args retrieval (with defaults, types, conditions...)

// Detailed docs: http://students.washington.edu/kuksenok/docs/args.php.html

function addiarg(&$var, $name, $defval) {
    if (!isset($var[$name]) || !is_numeric($var[$name])) {
        $var[$name] = getiarg($name, $defval);
    }
}

function addsarg(&$var, $name, $defval) {
    if (!isset($var[$name])) {
        $var[$name] = getsarg($name, $defval);
    }
}

function addearg(&$var, $name, $arr) {
    if (!isset($var[$name]) || !in_array($var[$name], $arr)) {
        $var[$name] = getearg($name, $arr);
    }
}

function addmarg(&$var, $name, $defkey, $map) {
    if (!isset($var[$name]) || isset($map[$var[$name]])) {
        $var[$name] = getmarg($name, $defkey, $map);
    }
}

function setiarg(&$var, $name, $defval) {
    if (!isset($var) || is_numeric($var)) {
        $var = getiarg($name, $defval);
    }
}

function setsarg(&$var, $name, $defval) {
    if (!isset($var)) {
        $var = getsarg($name, $defval);
    }
}

function setearg(&$var, $name, $arr) {
    if (!isset($var) || in_array($var, $arr)) {
        $var = getearg($name, $arr);
    }
}

function setmarg(&$var, $name, $defkey, $map) {
    if (!isset($var) || isset($map[$var])) {
        $var = getmarg($name, $defkey, $map);
    }
}

function getiarg($name, $defval) {
    $iarg = (int) $defval;
    if (isset($_REQUEST[$name]) && is_numeric($_REQUEST[$name])) {
        $iarg = (int) $_REQUEST[$name];
    }
    return $iarg;
}

function getflag($name) {
    return (isset($_REQUEST[$name]));
}

function getsarg($name, $defval) {
    $sarg = $defval;
    if (isset($_REQUEST[$name])) {
        $sarg = $_REQUEST[$name];
    }
    return $sarg;
}

function getearg($name, $arr) {
    if (!is_array($arr)) {
        $arr = array($arr);
    }
    $sarg = $arr[0];
    if (isset($_REQUEST[$name]) && in_array($_REQUEST[$name], $arr)) {
        $sarg = $_REQUEST[$name];
    }
    return $sarg;
}

function getmarg($name, $defkey, $map) {
    if (!is_array($map)) {
        $map = array($map);
    }
    $sarg = $map[$defkey];
    if (isset($_REQUEST[$name]) && isset($map[$_REQUEST[$name]])) {
        $sarg = $map[$_REQUEST[$name]];
    }
    return $sarg;
}