3 files changed, 4 insertions, 4 deletions
diff --git a/modules/field/modules/field_sql_storage/field_sql_storage.module b/modules/field/modules/field_sql_storage/field_sql_storage.module
index f916968d1..bc1656bc4 100644
--- a/modules/field/modules/field_sql_storage/field_sql_storage.module
+++ b/modules/field/modules/field_sql_storage/field_sql_storage.module
@@ -106,7 +106,7 @@ function _field_sql_storage_indexname($name, $index) {
  */
 function _field_sql_storage_etid($entity_type) {
   $etid = variable_get('field_sql_storage_' . $entity_type . '_etid', NULL);
-  if (is_null($etid)) {
+  if (!isset($etid)) {
     $etid = db_insert('field_config_entity_type')->fields(array('type' => $entity_type))->execute();
     variable_set('field_sql_storage_' . $entity_type . '_etid', $etid);
   }
diff --git a/modules/field/tests/field_test.module b/modules/field/tests/field_test.module
index 3767a8014..425432303 100644
--- a/modules/field/tests/field_test.module
+++ b/modules/field/tests/field_test.module
@@ -152,7 +152,7 @@ function field_test_field_language_alter(&$display_language, $context) {
 function field_test_memorize($key = NULL, $value = NULL) {
   $memorize = &drupal_static(__FUNCTION__, NULL);
 
-  if (is_null($key)) {
+  if (!isset($key)) {
     $return = $memorize;
     $memorize = array();
     return $return;
diff --git a/modules/field/tests/field_test.storage.inc b/modules/field/tests/field_test.storage.inc
index 532598832..8d87c6eb0 100644
--- a/modules/field/tests/field_test.storage.inc
+++ b/modules/field/tests/field_test.storage.inc
@@ -70,7 +70,7 @@ function field_test_field_storage_details_alter(&$details, $field) {
  * Helper function: stores or retrieves data from the 'storage backend'.
  */
 function _field_test_storage_data($data = NULL) {
-  if (is_null($data)) {
+  if (!isset($data)) {
     return variable_get('field_test_storage_data', array());
   }
   else {
@@ -318,7 +318,7 @@ function field_test_field_storage_query($field_id, $conditions, $count, &$cursor
       }
 
       if ($match) {
-        if (is_null($skip) || $skipped >= $skip) {
+        if (!isset($skip) || $skipped >= $skip) {
           $cursor++;
           // If querying all revisions and the entity type has revisions, we need
           // to key the results by revision_ids.