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vendor/yiisoft/yii2/db/MigrationInterface.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db;
+
+/**
+ * The MigrationInterface defines the minimum set of methods to be implemented by a database migration.
+ *
+ * Each migration class should provide the [[up()]] method containing the logic for "upgrading" the database
+ * and the [[down()]] method for the "downgrading" logic.
+ *
+ * @author Klimov Paul <klimov@zfort.com>
+ * @since 2.0
+ */
+interface MigrationInterface
+{
+    /**
+     * This method contains the logic to be executed when applying this migration.
+     * @return bool return a false value to indicate the migration fails
+     * and should not proceed further. All other return values mean the migration succeeds.
+     */
+    public function up();
+
+    /**
+     * This method contains the logic to be executed when removing this migration.
+     * The default implementation throws an exception indicating the migration cannot be removed.
+     * @return bool return a false value to indicate the migration fails
+     * and should not proceed further. All other return values mean the migration succeeds.
+     */
+    public function down();
+}