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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 |
|---|---|
| 1000 | * Filter a specific default site option. |
| 1001 | * |
| 1002 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1003 | * |
| 1004 | * @since 3.4.0 |
| 1005 | * |
| 1006 | * @param mixed $default The value to return if the site option does not exist |
| 1007 | * in the database. |
| 1008 | */ |
| 1009 | return apply_filters( 'default_site_option_' . $option, $default ); |
| 1010 | } |
| 1011 | |
| 1012 | if ( ! is_multisite() ) { |
| 1013 | |
| 1014 | /** This filter is documented in wp-includes/option.php */ |
| 1015 | $default = apply_filters( 'default_site_option_' . $option, $default ); |
| 1016 | $value = get_option($option, $default); |
| 1017 | } else { |
| 1018 | $cache_key = "{$wpdb->siteid}:$option"; |
| 1019 | if ( $use_cache ) |
| 1020 | $value = wp_cache_get($cache_key, 'site-options'); |
| 1021 | |
| 1022 | if ( !isset($value) || (false === $value) ) { |
| 1023 | $row = $wpdb->get_row( $wpdb->prepare("SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) ); |
| 1024 | |
| Line | Code |
| 1029 | wp_cache_set( $cache_key, $value, 'site-options' ); |
| 1030 | } else { |
| 1031 | if ( ! is_array( $notoptions ) ) { |
| 1032 | $notoptions = array(); |
| 1033 | } |
| 1034 | $notoptions[$option] = true; |
| 1035 | wp_cache_set( $notoptions_key, $notoptions, 'site-options' ); |
| 1036 | |
| 1037 | /** This filter is documented in wp-includes/option.php */ |
| 1038 | $value = apply_filters( 'default_site_option_' . $option, $default ); |
| 1039 | } |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | /** |
| 1044 | * Filter the value of an existing site option. |
| 1045 | * |
| 1046 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1047 | * |