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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 |
|---|---|
| 1209 | * |
| 1210 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1211 | * |
| 1212 | * @since 2.9.0 As 'pre_update_site_option_' . $key |
| 1213 | * @since 3.0.0 |
| 1214 | * |
| 1215 | * @param mixed $value New value of site option. |
| 1216 | * @param mixed $old_value Old value of site option. |
| 1217 | */ |
| 1218 | $value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value ); |
| 1219 | |
| 1220 | if ( $value === $old_value ) |
| 1221 | return false; |
| 1222 | |
| 1223 | if ( false === $old_value ) |
| 1224 | return add_site_option( $option, $value ); |
| 1225 | |
| 1226 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 1227 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |