Fixed several formatting issues.

Refactored == null to is_null == '' to empty(...)

framework/yii/db/pgsql/PDO.php

@@ -16,13 +16,14 @@ namespace yii\db\pgsql;
  * @author Gevik babakhani <gevikb@gmail.com>
  * @since 2.0
  */
-class PDO extends \PDO {
+class PDO extends \PDO
+{
 
 	const OPT_SEARCH_PATH = 'search_path';
 	const OPT_DEFAULT_SCHEMA = 'default_schema';
 	const DEFAULT_SCHEMA = 'public';
 
-	private $_currentDatabase = null;
+	private $_currentDatabase;
 
 	/**
 	 * Returns value of the last inserted ID.
@@ -53,11 +54,11 @@ class PDO extends \PDO {
 			}
 			if (isset($options[self::OPT_DEFAULT_SCHEMA])) {
 				$schema = trim($options[self::OPT_DEFAULT_SCHEMA]);
-				if ($schema !== '') {
+				if (!empty($schema)) {
 					Schema::$DEFAULT_SCHEMA = $schema;
 				}
 			}
-			if (Schema::$DEFAULT_SCHEMA === null || Schema::$DEFAULT_SCHEMA === '') {
+			if (is_null(Schema::$DEFAULT_SCHEMA) || empty(Schema::$DEFAULT_SCHEMA)) {
 				Schema::$DEFAULT_SCHEMA = self::DEFAULT_SCHEMA;
 			}
 		}

framework/yii/db/pgsql/QueryBuilder.php

@@ -14,7 +14,8 @@ namespace yii\db\pgsql;
  * @author Gevik Babakhani <gevikb@gmail.com>
  * @since 2.0
  */
-class QueryBuilder extends \yii\db\QueryBuilder {
+class QueryBuilder extends \yii\db\QueryBuilder
+{
 
 	/**
 	 * @var array mapping from abstract column types (keys) to physical column types (values).

framework/yii/db/pgsql/Schema.php

@@ -18,7 +18,8 @@ use yii\db\ColumnSchema;
  * @author Gevik Babakhani <gevikb@gmail.com>
  * @since 2.0
  */
-class Schema extends \yii\db\Schema {
+class Schema extends \yii\db\Schema
+{
 
 	/**
 	 * The default schema used for the current session. This value is