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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 |
|---|---|
| 1029 | * Filter the value of a specific site option before it is added. |
| 1030 | * |
| 1031 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1032 | * |
| 1033 | * @since 2.9.0 As 'pre_add_site_option_' . $key |
| 1034 | * @since 3.0.0 |
| 1035 | * |
| 1036 | * @param mixed $value Value of site option. |
| 1037 | */ |
| 1038 | $value = apply_filters( 'pre_add_site_option_' . $option, $value ); |
| 1039 | |
| 1040 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 1041 | |
| 1042 | if ( !is_multisite() ) { |
| 1043 | $result = add_option( $option, $value ); |
| 1044 | } else { |
| 1045 | $cache_key = "{$wpdb->siteid}:$option"; |
| 1046 | |
| 1047 | // Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query |