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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 |
|---|---|
| 944 | * Filter a specific default site option. |
| 945 | * |
| 946 | * The dynamic portion of the hook name, $option, refers to the option name. |
| 947 | * |
| 948 | * @since 3.4.0 |
| 949 | * |
| 950 | * @param mixed $default The value to return if the site option does not exist |
| 951 | * in the database. |
| 952 | */ |
| 953 | return apply_filters( 'default_site_option_' . $option, $default ); |
| 954 | } |
| 955 | |
| 956 | if ( ! is_multisite() ) { |
| 957 | |
| 958 | /** This filter is documented in wp-includes/option.php */ |
| 959 | $default = apply_filters( 'default_site_option_' . $option, $default ); |
| 960 | $value = get_option($option, $default); |
| 961 | } else { |
| 962 | $cache_key = "{$wpdb->siteid}:$option"; |
| 963 | if ( $use_cache ) |
| 964 | $value = wp_cache_get($cache_key, 'site-options'); |
| 965 | |
| 966 | if ( !isset($value) || (false === $value) ) { |
| 967 | $row = $wpdb->get_row( $wpdb->prepare("SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ); |
| 968 | |
| Line | Code |
| 970 | if ( is_object( $row ) ) { |
| 971 | $value = $row->meta_value; |
| 972 | $value = maybe_unserialize( $value ); |
| 973 | wp_cache_set( $cache_key, $value, 'site-options' ); |
| 974 | } else { |
| 975 | $notoptions[$option] = true; |
| 976 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 977 | |
| 978 | /** This filter is documented in wp-includes/option.php */ |
| 979 | $value = apply_filters( 'default_site_option_' . $option, $default ); |
| 980 | } |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | /** |
| 985 | * Filter the value of an existing site option. |
| 986 | * |
| 987 | * The dynamic portion of the hook name, $option, refers to the option name. |
| 988 | * |