3 files changed, 9 insertions, 9 deletions
diff --git a/include/dblayer/functions_pdo-sqlite.inc.php b/include/dblayer/functions_pdo-sqlite.inc.php
index a4c3881f0..a1f0a7833 100644
--- a/include/dblayer/functions_pdo-sqlite.inc.php
+++ b/include/dblayer/functions_pdo-sqlite.inc.php
@@ -467,13 +467,13 @@ function get_boolean( $string )
  */
 function boolean_to_string($var)
 {
-  if (!empty($var) && ($var == 'true'))
+  if (is_bool($var))
   {
-    return 'true';
+    return $var ? 'true' : 'false';
   }
   else
   {
-    return 'false';
+    return $var;
   }
 }
 
diff --git a/include/dblayer/functions_pgsql.inc.php b/include/dblayer/functions_pgsql.inc.php
index 5e05fb16a..38fcc2ed9 100644
--- a/include/dblayer/functions_pgsql.inc.php
+++ b/include/dblayer/functions_pgsql.inc.php
@@ -510,13 +510,13 @@ function get_boolean( $string )
  */
 function boolean_to_string($var)
 {
-  if (!empty($var) && ($var == 't'))
+  if (is_bool($var))
   {
-    return 'true';
+    return $var ? 'true' : 'false';
   }
   else
   {
-    return 'false';
+    return $var;
   }
 }
 
diff --git a/include/dblayer/functions_sqlite.inc.php b/include/dblayer/functions_sqlite.inc.php
index 1b34d3fcb..9de81868d 100644
--- a/include/dblayer/functions_sqlite.inc.php
+++ b/include/dblayer/functions_sqlite.inc.php
@@ -479,13 +479,13 @@ function get_boolean( $string )
  */
 function boolean_to_string($var)
 {
-  if (!empty($var) && ($var == 'true'))
+  if (is_bool($var))
   {
-    return 'true';
+    return $var ? 'true' : 'false';
   }
   else
   {
-    return 'false';
+    return $var;
   }
 }