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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 |
|---|---|
| 411 | |
| 412 | /** |
| 413 | * Fires before an option is added. |
| 414 | * |
| 415 | * @since 2.9.0 |
| 416 | * |
| 417 | * @param string $option Name of the option to add. |
| 418 | * @param mixed $value Value of the option. |
| 419 | */ |
| 420 | do_action( 'add_option', $option, $value ); |
| 421 | |
| 422 | $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 ) ); |
| 423 | if ( ! $result ) |
| 424 | return false; |
| 425 | |
| 426 | if ( ! defined( 'WP_INSTALLING' ) ) { |
| 427 | if ( 'yes' == $autoload ) { |
| 428 | $alloptions = wp_load_alloptions(); |
| 429 | $alloptions[ $option ] = $serialized_value; |