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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 |
|---|---|
| 1016 | * Filter the value of a specific site option before it is added. |
| 1017 | * |
| 1018 | * The dynamic portion of the hook name, $option, refers to the option name. |
| 1019 | * |
| 1020 | * @since 2.9.0 As 'pre_add_site_option_' . $key |
| 1021 | * @since 3.0.0 |
| 1022 | * |
| 1023 | * @param mixed $value Value of site option. |
| 1024 | */ |
| 1025 | $value = apply_filters( 'pre_add_site_option_' . $option, $value ); |
| 1026 | |
| 1027 | $notoptions_key = "{$wpdb->siteid}:notoptions"; |
| 1028 | |
| 1029 | if ( !is_multisite() ) { |
| 1030 | $result = add_option( $option, $value ); |
| 1031 | } else { |
| 1032 | $cache_key = "{$wpdb->siteid}:$option"; |
| 1033 | |
| 1034 | // Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query |