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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 |
|---|---|
| 448 | echo ' <a class="button" href="' . esc_url( self_admin_url('update-core.php') ) . '">' . __( 'Check Again' ) . '</a>'; |
| 449 | echo '</p>'; |
| 450 | |
| 451 | if ( current_user_can( 'update_core' ) ) |
| 452 | core_upgrade_preamble(); |
| 453 | if ( current_user_can( 'update_plugins' ) ) |
| 454 | list_plugin_updates(); |
| 455 | if ( current_user_can( 'update_themes' ) ) |
| 456 | list_theme_updates(); |
| 457 | do_action('core_upgrade_preamble'); |
| 458 | echo '</div>'; |
| 459 | include(ABSPATH . 'wp-admin/admin-footer.php'); |
| 460 | |
| 461 | } elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) { |
| 462 | |
| 463 | if ( ! current_user_can( 'update_core' ) ) |
| 464 | wp_die( __( 'You do not have sufficient permissions to update this site.' ) ); |
| 465 | |
| 466 | check_admin_referer('upgrade-core'); |