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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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 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 = wp_cache_get( 'notoptions', 'site-options' ); |
| 761 | if ( isset( $notoptions[$option] ) ) |
| 762 | return apply_filters( 'default_site_option_' . $option, $default ); |
| 763 | |
| 764 | if ( ! is_multisite() ) { |
| 765 | $default = apply_filters( 'default_site_option_' . $option, $default ); |
| 766 | $value = get_option($option, $default); |
| 767 | } else { |
| 768 | $cache_key = "{$wpdb->siteid}:$option"; |
| 769 | if ( $use_cache ) |
| 770 | $value = wp_cache_get($cache_key, 'site-options'); |
| 771 | |
| 772 | if ( !isset($value) || (false === $value) ) { |
| 773 | $row = $wpdb->get_row( $wpdb->prepare("SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ); |
| 774 | |
| 775 | // Has to be get_row instead of get_var because of funkiness with 0, false, null values |
| 776 | if ( is_object( $row ) ) { |
| 777 | $value = $row->meta_value; |
| 778 | $value = maybe_unserialize( $value ); |
| 779 | wp_cache_set( $cache_key, $value, 'site-options' ); |
| 780 | } else { |
| 781 | $notoptions[$option] = true; |
| 782 | wp_cache_set( 'notoptions', $notoptions, 'site-options' ); |
| 783 | $value = apply_filters( 'default_site_option_' . $option, $default ); |
| 784 | } |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | return apply_filters( 'site_option_' . $option, $value ); |
| 789 | } |
| 790 | |
| 791 | /** |
| 792 | * Add a new site option. |