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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 |
|---|---|
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Filters the options whitelist. |
| 200 | * |
| 201 | * @since 2.7.0 |
| 202 | * |
| 203 | * @param array $whitelist_options The options whitelist. |
| 204 | */ |
| 205 | $whitelist_options = apply_filters( 'whitelist_options', $whitelist_options ); |
| 206 | |
| 207 | if ( 'update' == $action ) { // We are saving settings sent from a settings page. |
| 208 | if ( 'options' == $option_page && ! isset( $_POST['option_page'] ) ) { // This is for back compat and will eventually be removed. |
| 209 | $unregistered = true; |
| 210 | check_admin_referer( 'update-options' ); |
| 211 | } else { |
| 212 | $unregistered = false; |
| 213 | check_admin_referer( $option_page . '-options' ); |
| 214 | } |