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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 |
|---|---|
| 276 | /** |
| 277 | * Fires immediately before an option value is updated. |
| 278 | * |
| 279 | * @since 2.9.0 |
| 280 | * |
| 281 | * @param string $option Name of the option to update. |
| 282 | * @param mixed $old_value The old option value. |
| 283 | * @param mixed $value The new option value. |
| 284 | */ |
| 285 | do_action( 'update_option', $option, $old_value, $value ); |
| 286 | |
| 287 | $result = $wpdb->update( $wpdb->options, array( 'option_value' => $serialized_value ), array( 'option_name' => $option ) ); |
| 288 | if ( ! $result ) |
| 289 | return false; |
| 290 | |
| 291 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 292 | if ( is_array( $notoptions ) && isset( $notoptions[$option] ) ) { |
| 293 | unset( $notoptions[$option] ); |
| 294 | wp_cache_set( 'notoptions', $notoptions, 'options' ); |