diff --git a/ext/pdo/tests/pdo_015.phpt b/ext/pdo/tests/pdo_015.phpt
index 15e73a0a87846..3e610e76ad569 100644
--- a/ext/pdo/tests/pdo_015.phpt
+++ b/ext/pdo/tests/pdo_015.phpt
@@ -19,26 +19,40 @@ $db->exec('CREATE TABLE test015(id int NOT NULL PRIMARY KEY, val VARCHAR(10), va
 $db->exec("INSERT INTO test015 VALUES(1, 'A', 'A2')");
 $db->exec("INSERT INTO test015 VALUES(2, 'A', 'B2')");
 
-$select1 = $db->prepare('SELECT id, val, val2 FROM test015');
-$select2 = $db->prepare('SELECT val, val2 FROM test015');
+$selectIdVal1Val2 = $db->prepare('SELECT id, val, val2 FROM test015');
 
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN));
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN, 2));
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE));
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 0));
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 1));
-$select1->execute();
-var_dump($select1->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 2));
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN));
 
-$select2->execute();
-var_dump($select2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN, 2)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN, 2));
+
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
+
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE));
+
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 0)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 0));
+
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 1)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 1));
+
+$selectIdVal1Val2->execute();
+echo '$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 2)', PHP_EOL;
+var_dump($selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 2));
+
+$selectVal1Val2 = $db->prepare('SELECT val, val2 FROM test015');
+$selectVal1Val2->execute();
+echo '$selectVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP)', PHP_EOL;
+var_dump($selectVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP));
 
 ?>
 --CLEAN--
@@ -48,18 +62,21 @@ $db = PDOTest::factory();
 PDOTest::dropTableIfExists($db, "test015");
 ?>
 --EXPECT--
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN)
 array(2) {
   [0]=>
   string(1) "1"
   [1]=>
   string(1) "2"
 }
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN, 2)
 array(2) {
   [0]=>
   string(2) "A2"
   [1]=>
   string(2) "B2"
 }
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP)
 array(2) {
   [1]=>
   array(1) {
@@ -72,30 +89,35 @@ array(2) {
     string(1) "A"
   }
 }
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE)
 array(2) {
   [1]=>
   string(1) "A"
   [2]=>
   string(1) "A"
 }
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 0)
 array(2) {
   [1]=>
   string(1) "1"
   [2]=>
   string(1) "2"
 }
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 1)
 array(2) {
   [1]=>
   string(1) "A"
   [2]=>
   string(1) "A"
 }
+$selectIdVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_UNIQUE, 2)
 array(2) {
   [1]=>
   string(2) "A2"
   [2]=>
   string(2) "B2"
 }
+$selectVal1Val2->fetchAll(PDO::FETCH_COLUMN|PDO::FETCH_GROUP)
 array(1) {
   ["A"]=>
   array(2) {