diff --git a/src/includes/class/class.LSattr_html.php b/src/includes/class/class.LSattr_html.php
index d373af1a..fba6eb06 100644
--- a/src/includes/class/class.LSattr_html.php
+++ b/src/includes/class/class.LSattr_html.php
@@ -94,9 +94,8 @@ class LSattr_html extends LSlog_staticLoggerClass {
       LSerror :: addErrorCode('LSform_06',$this -> name);
       return;
     }
-    if ($data) {
+    if (!is_null($data))
       $element -> setValue($data);
-    }
     return $element;
   }
 
diff --git a/src/includes/class/class.LSattribute.php b/src/includes/class/class.LSattribute.php
index d98752bb..19812c93 100644
--- a/src/includes/class/class.LSattribute.php
+++ b/src/includes/class/class.LSattribute.php
@@ -115,9 +115,10 @@ class LSattribute extends LSlog_staticLoggerClass {
    * @retval boolean true
    */
   public function loadData($attr_data) {
-    if ((!is_array($attr_data))&&(!empty($attr_data))) {
+    if (is_empty($attr_data) || $attr_data === false)
+      $attr_data = null;
+    elseif (!is_array($attr_data))
       $attr_data = array($attr_data);
-    }
     $this -> data = $attr_data;
     return true;
   }
@@ -231,13 +232,13 @@ class LSattribute extends LSlog_staticLoggerClass {
       if($this -> myRights() == 'n') {
         return true;
       }
-      if ($value) {
+      if (!is_null($value)) {
         $data = $value;
       }
-      else if($this -> data !='') {
+      else if(!is_empty($this -> data)) {
         $data = $this -> getFormVal();
       }
-      else if ($this -> getConfig('default_value')) {
+      else if (!is_empty($this -> getConfig('default_value'))) {
         $data = $obj -> getFData($this -> getConfig('default_value'));
       }
       else {
@@ -338,11 +339,11 @@ class LSattribute extends LSlog_staticLoggerClass {
         LSerror :: addErrorCode('LSattribute_09',array('type' => 'html','name' => $this -> name));
         return;
       }
-      if($this -> data !='') {
-        $data=$this -> getFormVal();
+      if(!is_empty($this -> data)) {
+        $data = $this -> getFormVal();
       }
       else {
-        $data='';
+        $data=null;
       }
       $element = $this -> html -> addToForm($form,'view',$data);
       if(!$element instanceof LSformElement) {
diff --git a/src/includes/class/class.LSform.php b/src/includes/class/class.LSform.php
index 522d6173..82bb739a 100644
--- a/src/includes/class/class.LSform.php
+++ b/src/includes/class/class.LSform.php
@@ -412,7 +412,7 @@ class LSform extends LSlog_staticLoggerClass {
    */
   public function checkRequired($data) {
     foreach($data as $val) {
-      if (!empty($val)||(is_string($val)&&($val=="0")))
+      if (!is_empty($val))
         return true;
     }
     return;
diff --git a/src/includes/class/class.LSformElement.php b/src/includes/class/class.LSformElement.php
index 1c8c6721..0b2e0356 100644
--- a/src/includes/class/class.LSformElement.php
+++ b/src/includes/class/class.LSformElement.php
@@ -258,7 +258,7 @@ class LSformElement extends LSlog_staticLoggerClass {
         $post[$name] = array($post[$name]);
       }
       foreach($post[$name] as $key => $val) {
-        if (!empty($val)||(is_string($val)&&($val=="0"))) {
+        if (!is_empty($val)) {
           $return[$key] = $val;
         }
       }
diff --git a/src/includes/class/class.LSformElement_labeledValue.php b/src/includes/class/class.LSformElement_labeledValue.php
index c0b8ed16..36c6d270 100644
--- a/src/includes/class/class.LSformElement_labeledValue.php
+++ b/src/includes/class/class.LSformElement_labeledValue.php
@@ -122,7 +122,7 @@ class LSformElement_labeledValue extends LSformElement {
       }
       foreach($_POST[$this -> name."_labels"] as $key => $label) {
         $val=$_POST[$this -> name."_values"][$key];
-        if (!empty($label) && (!empty($val)||(is_string($val)&&($val=="0")))) {
+        if (!empty($label) && !is_empty($val)) {
           $return[$this -> name][$key] = "[$label]$val";
         }
       }
diff --git a/src/includes/class/class.LSldap.php b/src/includes/class/class.LSldap.php
index 249cf0da..21f083b9 100644
--- a/src/includes/class/class.LSldap.php
+++ b/src/includes/class/class.LSldap.php
@@ -314,14 +314,14 @@ class LSldap extends LSlog_staticLoggerClass {
       $drop = true;
       if (is_array($attrVal)) {
         foreach($attrVal as $val) {
-          if (!empty($val)||(is_string($val)&&($val=="0"))) {
+          if (!is_empty($val)) {
             $drop = false;
             $changed_attrs[$attrName][]=$val;
           }
         }
       }
       else {
-        if (!empty($attrVal)||(is_string($attrVal)&&($attrVal=="0"))) {
+        if (!is_empty($val)) {
           $drop = false;
           $changed_attrs[$attrName][]=$attrVal;
         }
diff --git a/src/includes/functions.php b/src/includes/functions.php
index 4b8da721..19bbfbf5 100644
--- a/src/includes/functions.php
+++ b/src/includes/functions.php
@@ -764,3 +764,21 @@ function format_callable($callable) {
         else
                 return $callable."()";
 }
+
+function is_empty($val) {
+  switch(gettype($val)) {
+    case "boolean":
+    case "integer":
+    case "double":
+    case "object":
+    case "resource":
+            return False;
+    case "array":
+    case "string":
+      if ($val == "0") return false;
+      return empty($val);
+    case "NULL":
+      return True;
+  }
+  return empty($val);
+}