diff --git a/application/menunode.class.inc.php b/application/menunode.class.inc.php
index 336c91187..60a0edef8 100644
--- a/application/menunode.class.inc.php
+++ b/application/menunode.class.inc.php
@@ -655,7 +655,7 @@ abstract class MenuNode
 		$this->sMenuId = $sMenuId;
 		$this->iParentIndex = $iParentIndex;
 		$this->aReflectionProperties = array();
-		if (strlen($sEnableClass) > 0)
+		if (utils::StrLen($sEnableClass) > 0)
 		{
 			$this->aReflectionProperties['enable_class'] = $sEnableClass;
 			$this->aReflectionProperties['enable_action'] = $iActionCode;
diff --git a/core/metamodel.class.php b/core/metamodel.class.php
index e975ae448..2d95a5bcd 100644
--- a/core/metamodel.class.php
+++ b/core/metamodel.class.php
@@ -461,7 +461,7 @@ abstract class MetaModel
 			$oStyle = self::$m_aClassParams[$sClass]['style'];
 			$sIcon = $oStyle->GetIconAsAbsUrl();
 		}
-		if (strlen($sIcon) == 0) {
+		if (utils::StrLen($sIcon) == 0) {
 			$sParentClass = self::GetParentPersistentClass($sClass);
 			if (strlen($sParentClass) > 0) {
 				return self::GetClassIcon($sParentClass, $bImgTag, $sMoreStyles);
@@ -494,7 +494,7 @@ abstract class MetaModel
 			$oStyle = new ormStyle("ibo-class-style--$sClass", "ibo-class-style-alt--$sClass");
 		}
 
-		if ((strlen($oStyle->GetMainColor()) > 0) && (strlen($oStyle->GetComplementaryColor()) > 0) && (strlen($oStyle->GetIconAsRelPath()) > 0)) {
+		if ((utils::StrLen($oStyle->GetMainColor()) > 0) && (utils::StrLen($oStyle->GetComplementaryColor()) > 0) && (utils::StrLen($oStyle->GetIconAsRelPath()) > 0)) {
 			// all the parameters are set, no need to search in the parent classes
 			return $oStyle;
 		}
@@ -504,18 +504,18 @@ abstract class MetaModel
 		while (strlen($sParentClass) > 0) {
 			$oParentStyle = self::GetClassStyle($sParentClass);
 			if (!is_null($oParentStyle)) {
-				if (strlen($oStyle->GetMainColor()) == 0) {
+				if (utils::StrLen($oStyle->GetMainColor()) == 0) {
 					$oStyle->SetMainColor($oParentStyle->GetMainColor());
 					$oStyle->SetStyleClass($oParentStyle->GetStyleClass());
 				}
-				if (strlen($oStyle->GetComplementaryColor()) == 0) {
+				if (utils::StrLen($oStyle->GetComplementaryColor()) == 0) {
 					$oStyle->SetComplementaryColor($oParentStyle->GetComplementaryColor());
 					$oStyle->SetAltStyleClass($oParentStyle->GetAltStyleClass());
 				}
-				if (strlen($oStyle->GetIconAsRelPath()) == 0) {
+				if (utils::StrLen($oStyle->GetIconAsRelPath()) == 0) {
 					$oStyle->SetIcon($oParentStyle->GetIconAsRelPath());
 				}
-				if ((strlen($oStyle->GetMainColor()) > 0) && (strlen($oStyle->GetComplementaryColor()) > 0) && (strlen($oStyle->GetIconAsRelPath()) > 0)) {
+				if ((utils::StrLen($oStyle->GetMainColor()) > 0) && (utils::StrLen($oStyle->GetComplementaryColor()) > 0) && (utils::StrLen($oStyle->GetIconAsRelPath()) > 0)) {
 					// all the parameters are set, no need to search in the parent classes
 					return $oStyle;
 				}
@@ -523,7 +523,7 @@ abstract class MetaModel
 			$sParentClass = self::GetParentPersistentClass($sParentClass);
 		}
 
-		if ((strlen($oStyle->GetMainColor()) == 0) && (strlen($oStyle->GetComplementaryColor()) == 0) && (strlen($oStyle->GetIconAsRelPath()) == 0)) {
+		if ((utils::StrLen($oStyle->GetMainColor()) == 0) && (utils::StrLen($oStyle->GetComplementaryColor()) == 0) && (utils::StrLen($oStyle->GetIconAsRelPath()) == 0)) {
 			return null;
 		}
 
diff --git a/sources/application/UI/Base/Component/Button/ButtonUIBlockFactory.php b/sources/application/UI/Base/Component/Button/ButtonUIBlockFactory.php
index 7867aefe5..624acca97 100644
--- a/sources/application/UI/Base/Component/Button/ButtonUIBlockFactory.php
+++ b/sources/application/UI/Base/Component/Button/ButtonUIBlockFactory.php
@@ -423,11 +423,11 @@ class ButtonUIBlockFactory extends AbstractUIBlockFactory
 		$oButton->SetActionType($sActionType)
 			->SetColor($sColor);
 
-		if (strlen($sValue) > 0) {
+		if (utils::StrLen($sValue) > 0) {
 			$oButton->SetValue($sValue);
 		}
 
-		if (strlen($sName) > 0) {
+		if (utils::StrLen($sName) > 0) {
 			$oButton->SetName($sName);
 		}