Fix issue with Query_Builder->where_in() method

classes/query_builder.php

@@ -698,12 +698,12 @@ class Query_Builder {
 		$key = $this->quote_ident($key);
 		$params = array_fill(0, count($val), '?');
 
-		foreach($val as &$v)
+		foreach($val as $v)
 		{
 			$this->values[] = $v;
 		}
 
-		$string = $key . " {$in} ".implode(',', $params).') ';
+		$string = $key . " {$in} (".implode(',', $params).') ';
 
 		$this->query_map[] = array(
 			'type' => 'where_in',

tests/core/db_qb_test.php

@@ -173,6 +173,19 @@ abstract class QBTest extends UnitTestCase {
 
 	// --------------------------------------------------------------------------
 
+	public function TestWhereIn()
+	{
+		if (empty($this->db)) return;
+
+		$query = $this->db->from('create_test')
+			->where_in('id', array(0, 6, 56, 563, 341))
+			->get();
+
+		$this->assertIsA($query, 'PDOStatement');
+	}
+
+	// --------------------------------------------------------------------------
+
 	public function TestSelectAvg()
 	{
 		if (empty($this->db))  return;