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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 |
|---|---|
| 1216 | * The dynamic portion of the hook name, `$option`, refers to the option name. |
| 1217 | * |
| 1218 | * @since 2.9.0 As 'pre_add_site_option_' . $key |
| 1219 | * @since 3.0.0 |
| 1220 | * @since 4.4.0 The `$option` parameter was added |
| 1221 | * |
| 1222 | * @param mixed $value Value of network option. |
| 1223 | * @param string $option Option name. |
| 1224 | */ |
| 1225 | $value = apply_filters( 'pre_add_site_option_' . $option, $value, $option ); |
| 1226 | |
| 1227 | $notoptions_key = "$network_id:notoptions"; |
| 1228 | |
| 1229 | if ( ! is_multisite() ) { |
| 1230 | $result = add_option( $option, $value, '', 'no' ); |
| 1231 | } else { |
| 1232 | $cache_key = "$network_id:$option"; |
| 1233 | |
| 1234 | // Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query |