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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 |
|---|---|
| 1185 | * |
| 1186 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1187 | * |
| 1188 | * @since 2.9.0 As 'pre_update_site_option_' . $key |
| 1189 | * @since 3.0.0 |
| 1190 | * |
| 1191 | * @param mixed $value New value of site option. |
| 1192 | * @param mixed $old_value Old value of site option. |
| 1193 | */ |
| 1194 | $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value ); |
| 1195 | |
| 1196 | if ( $value === $old_value ) |
| 1197 | return false; |
| 1198 | |
| 1199 | if ( false === $old_value ) |
| 1200 | return add_site_option( $option, $value ); |
| 1201 | |
| 1202 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 1203 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |