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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 |
|---|---|
| 493 | |
| 494 | /** |
| 495 | * Fires before an option is added. |
| 496 | * |
| 497 | * @since 2.9.0 |
| 498 | * |
| 499 | * @param string $option Name of the option to add. |
| 500 | * @param mixed $value Value of the option. |
| 501 | */ |
| 502 | do_action( 'add_option', $option, $value ); |
| 503 | |
| 504 | $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 ) ); |
| 505 | if ( ! $result ) { |
| 506 | return false; |
| 507 | } |
| 508 | |
| 509 | if ( ! wp_installing() ) { |
| 510 | if ( 'yes' == $autoload ) { |
| 511 | $alloptions = wp_load_alloptions( true ); |