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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 |
|---|---|
| 910 | * @param mixed $value Option value. Expected to not be SQL-escaped. |
| 911 | * @return bool False if value was not updated and true if value was updated. |
| 912 | */ |
| 913 | function update_site_option( $option, $value ) { |
| 914 | global $wpdb; |
| 915 | |
| 916 | wp_protect_special_option( $option ); |
| 917 | |
| 918 | $old_value = get_site_option( $option ); |
| 919 | $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value ); |
| 920 | |
| 921 | if ( $value === $old_value ) |
| 922 | return false; |
| 923 | |
| 924 | if ( false === $old_value ) |
| 925 | return add_site_option( $option, $value ); |
| 926 | |
| 927 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 928 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |