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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 86 | if ( get_site_option( 'wpmu_upgrade_site' ) != $GLOBALS['wp_db_version'] ) : |
| 87 | ?> |
| 88 | <h3><?php _e( 'Database Upgrade Required' ); ?></h3> |
| 89 | <p><?php _e( 'WordPress has been updated! Before we send you on your way, we need to individually upgrade the sites in your network.' ); ?></p> |
| 90 | <?php endif; ?> |
| 91 | |
| 92 | <p><?php _e( 'The database upgrade process may take a little while, so please be patient.' ); ?></p> |
| 93 | <p><a class="button" href="upgrade.php?action=upgrade"><?php _e( 'Upgrade Network' ); ?></a></p> |
| 94 | <?php |
| 95 | do_action( 'wpmu_upgrade_page' ); |
| 96 | break; |
| 97 | } |
| 98 | ?> |
| 99 | </div> |
| 100 | |
| 101 | <?php include( ABSPATH . 'wp-admin/admin-footer.php' ); ?> |
| 102 | |