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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 |
|---|---|
| 1237 | * |
| 1238 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1239 | * |
| 1240 | * @since 2.9.0 As 'pre_update_site_option_' . $key |
| 1241 | * @since 3.0.0 |
| 1242 | * |
| 1243 | * @param mixed $value New value of site option. |
| 1244 | * @param mixed $old_value Old value of site option. |
| 1245 | */ |
| 1246 | $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value ); |
| 1247 | |
| 1248 | if ( $value === $old_value ) |
| 1249 | return false; |
| 1250 | |
| 1251 | if ( false === $old_value ) |
| 1252 | return add_site_option( $option, $value ); |
| 1253 | |
| 1254 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 1255 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |