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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 |
|---|---|
| 2922 | if ( ! is_main_site() ) { |
| 2923 | $should_upgrade = false; |
| 2924 | } |
| 2925 | |
| 2926 | /** |
| 2927 | * Filters if upgrade routines should be run on global tables. |
| 2928 | * |
| 2929 | * @param bool $should_upgrade Whether to run the upgrade routines on global tables. |
| 2930 | */ |
| 2931 | return apply_filters( 'wp_should_upgrade_global_tables', $should_upgrade ); |
| 2932 | } |
| 2933 | |