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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 |
---|---|
513 | if ( $core = current_user_can( 'update_core' ) ) |
514 | core_upgrade_preamble(); |
515 | if ( $plugins = current_user_can( 'update_plugins' ) ) |
516 | list_plugin_updates(); |
517 | if ( $themes = current_user_can( 'update_themes' ) ) |
518 | list_theme_updates(); |
519 | if ( $core || $plugins || $themes ) |
520 | list_translation_updates(); |
521 | unset( $core, $plugins, $themes ); |
522 | do_action('core_upgrade_preamble'); |
523 | echo '</div>'; |
524 | include(ABSPATH . 'wp-admin/admin-footer.php'); |
525 |
|
526 | } elseif ( 'do-core-upgrade' == $action || 'do-core-reinstall' == $action ) { |
527 |
|
528 | if ( ! current_user_can( 'update_core' ) ) |
529 | wp_die( __( 'You do not have sufficient permissions to update this site.' ) ); |
530 |
|
531 | check_admin_referer('upgrade-core'); |