REQUIRED_D6_SCHEMA_VERSION
constant REQUIRED_D6_SCHEMA_VERSION
Minimum schema version of Drupal 6 required for upgrade to Drupal 7.
Upgrades from Drupal 6 to Drupal 7 require that Drupal 6 be running the most recent version, or the upgrade could fail. We can't easily check the Drupal 6 version once the update process has begun, so instead we check the schema version of system.module in the system table.
File
- includes/update.inc, line 19
- Drupal database update API.
Code
define('REQUIRED_D6_SCHEMA_VERSION', '6055')
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https://api.drupal.org/api/drupal/includes!update.inc/constant/REQUIRED_D6_SCHEMA_VERSION/7.x