Fix bug 1695 : incorrect boolean to string conversion for SQLite and PostgreSQL database engines merge from trunk

git-svn-id: http://piwigo.org/svn/branches/2.1@6342 68402e56-0260-453c-a942-63ccdbb3a9ee

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;
   }
 }
 

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;
   }
 }
 

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;
   }
 }