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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 |
|---|---|
| 3774 | * |
| 3775 | * @param string $option Name of option. Expected to not be SQL-escaped. |
| 3776 | * @param mixed $value Option value. Expected to not be SQL-escaped. |
| 3777 | * @return bool False if value was not updated and true if value was updated. |
| 3778 | */ |
| 3779 | function update_site_option( $option, $value ) { |
| 3780 | global $wpdb; |
| 3781 | |
| 3782 | $oldvalue = get_site_option( $option ); |
| 3783 | $value = apply_filters( 'pre_update_site_option_' . $option, $value, $oldvalue ); |
| 3784 | |
| 3785 | if ( $value === $oldvalue ) |
| 3786 | return false; |
| 3787 | |
| 3788 | if ( !is_multisite() ) { |
| 3789 | $result = update_option( $option, $value ); |
| 3790 | } else { |
| 3791 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3792 | |