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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 |
|---|---|
| 938 | * |
| 939 | * Passing a truthy value to the filter will effectively short-circuit retrieval, |
| 940 | * returning the passed value instead. |
| 941 | * |
| 942 | * @since 2.9.0 As 'pre_site_option_' . $key |
| 943 | * @since 3.0.0 |
| 944 | * |
| 945 | * @param mixed $pre_option The default value to return if the option does not exist. |
| 946 | */ |
| 947 | $pre = apply_filters( 'pre_site_option_' . $option, false ); |
| 948 | |
| 949 | if ( false !== $pre ) |
| 950 | return $pre; |
| 951 | |
| 952 | // prevent non-existent options from triggering multiple queries |
| 953 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 954 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
| 955 | |
| 956 | if ( isset( $notoptions[$option] ) ) { |