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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 |
|---|---|
| 3819 | * @param string $option Name of option to retrieve. Expected to not be SQL-escaped. |
| 3820 | * @param mixed $default Optional value to return if option doesn't exist. Default false. |
| 3821 | * @param bool $use_cache Whether to use cache. Multisite only. Default true. |
| 3822 | * @return mixed Value set for the option. |
| 3823 | */ |
| 3824 | function get_site_option( $option, $default = false, $use_cache = true ) { |
| 3825 | global $wpdb; |
| 3826 | |
| 3827 | // Allow plugins to short-circuit site options. |
| 3828 | $pre = apply_filters( 'pre_site_option_' . $option, false ); |
| 3829 | if ( false !== $pre ) |
| 3830 | return $pre; |
| 3831 | |
| 3832 | if ( !is_multisite() ) { |
| 3833 | $value = get_option($option, $default); |
| 3834 | } else { |
| 3835 | $cache_key = "{$wpdb->siteid}:$option"; |
| 3836 | if ( $use_cache ) |
| 3837 | $value = wp_cache_get($cache_key, 'site-options'); |