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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 |
|---|---|
| 746 | * @param string $option Name of option to retrieve. Expected to not be SQL-escaped. |
| 747 | * @param mixed $default Optional value to return if option doesn't exist. Default false. |
| 748 | * @param bool $use_cache Whether to use cache. Multisite only. Default true. |
| 749 | * @return mixed Value set for the option. |
| 750 | */ |
| 751 | function get_site_option( $option, $default = false, $use_cache = true ) { |
| 752 | global $wpdb; |
| 753 | |
| 754 | // Allow plugins to short-circuit site options. |
| 755 | $pre = apply_filters( 'pre_site_option_' . $option, false ); |
| 756 | if ( false !== $pre ) |
| 757 | return $pre; |
| 758 | |
| 759 | // prevent non-existent options from triggering multiple queries |
| 760 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 761 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
| 762 | if ( isset( $notoptions[$option] ) ) |
| 763 | return apply_filters( 'default_site_option_' . $option, $default ); |
| 764 | |