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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 |
|---|---|
| 3647 | * |
| 3648 | * @param string $option Name of option. Expected to not be SQL-escaped. |
| 3649 | * @param mixed $value Option value. Expected to not be SQL-escaped. |
| 3650 | * @return bool False if value was not updated and true if value was updated. |
| 3651 | */ |
| 3652 | function update_site_option( $option, $value ) { |
| 3653 | global $wpdb; |
| 3654 | |
| 3655 | $oldvalue = get_site_option( $option ); |
| 3656 | $value = apply_filters( 'pre_update_site_option_' . $option, $value, $oldvalue ); |
| 3657 | |
| 3658 | if ( $value === $oldvalue ) |
| 3659 | return false; |
| 3660 | |
| 3661 | if ( !is_multisite() ) { |
| 3662 | $result = update_option( $option, $value ); |
| 3663 | } else { |
| 3664 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3665 | |