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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 |
|---|---|
| 377 | |
| 378 | /** |
| 379 | * Fires before an option is added. |
| 380 | * |
| 381 | * @since 2.9.0 |
| 382 | * |
| 383 | * @param string $option Name of the option to add. |
| 384 | * @param mixed $value Value of the option. |
| 385 | */ |
| 386 | do_action( 'add_option', $option, $value ); |
| 387 | |
| 388 | $result = $wpdb->query( $wpdb->prepare( "INSERT INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE `option_name` = VALUES(`option_name`), `option_value` = VALUES(`option_value`), `autoload` = VALUES(`autoload`)", $option, $serialized_value, $autoload ) ); |
| 389 | if ( ! $result ) |
| 390 | return false; |
| 391 | |
| 392 | if ( ! defined( 'WP_INSTALLING' ) ) { |
| 393 | if ( 'yes' == $autoload ) { |
| 394 | $alloptions = wp_load_alloptions(); |
| 395 | $alloptions[ $option ] = $serialized_value; |