wp-admin/includes/upgrade.php:1584Execute changes made in WordPress 2.5.2.
function upgrade_252() { global $wpdb; $wpdb->query( "UPDATE $wpdb->users SET user_activation_key = ''" );}Introduced in 2.5.2. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/upgrade.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.