diff --git a/base.php b/base.php
index 5dc5568..d485723 100644
--- a/base.php
+++ b/base.php
@@ -75,6 +75,67 @@ function no_http() {
 		die('<h3>Forbidden, this method can only be called from shell</h3>');
 }
 
+function arg($arg, $default=null, $validator=null) {
+	$arg = trim($arg);
+	$type = 'string';
+
+	$require = false;
+	if (strpos($arg,'*') === 0) {
+		$require = true;
+		$arg = substr($arg, 1);
+	}
+
+	if (strpos($arg,'s:') === 0) {
+		$type = 'string';
+		$arg = substr($arg, 2);
+	} else if (strpos($arg,'i:') === 0) {
+		$type = 'integer';
+		$arg = substr($arg, 2);
+	} else if (strpos($arg,'d:') === 0) {
+		$type = 'double';
+		$arg = substr($arg, 2);
+	} else if (strpos($arg,'b64:') === 0) {
+		$type = 'base64';
+		$arg = substr($arg, 4);
+	}
+
+	$ps = explode('.', $arg);
+	$value = null;
+	$arr = null;
+	switch (strtolower($ps[0])) {
+		case 'get':
+			$arr = '_GET';
+			break;
+		case 'post':
+			$arr = '_POST';
+			break;
+	}
+	if ($arr === null)
+		$arr = $ps[0];
+	eval('$value = isset($'.$arr.'["'.$ps[1].'"]) ? $'.$arr.'["'.$ps[1].'"] : null;');
+	if ($value === null)
+		return !$require ? $default : apiresult(['error' => '<'.$arg.'> parameter must be specified'], 400);
+
+	$value = trim($value);
+	if ($type === 'string')
+		$value = strval($value);
+	else if ($type === 'integer')
+		$value = intval($value);
+	else if ($type === 'double')
+		$value = doubleval($value);
+	else if ($type === 'base64')
+		$value = base64_decode($value);
+
+	if ($validator !== null) {
+		$bool = false;
+		eval('$bool = '.$validator.'($value);');
+		if (!$bool)
+			return apiresult(['error' => '<'.$arg.'> parameter validation has failed'], 400);
+	}
+
+	return $value;
+}
+
 function mod_php($module_name=null) {
 	$null_mod = false;
 	if ($module_name === null) {