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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 |
|---|---|
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Filter the options white list. |
| 139 | * |
| 140 | * @since 2.7.0 |
| 141 | * |
| 142 | * @param array White list options. |
| 143 | */ |
| 144 | $whitelist_options = apply_filters( 'whitelist_options', $whitelist_options ); |
| 145 | |
| 146 | /* |
| 147 | * If $_GET['action'] == 'update' we are saving settings sent from a settings page |
| 148 | */ |
| 149 | if ( 'update' == $action ) { |
| 150 | if ( 'options' == $option_page && !isset( $_POST['option_page'] ) ) { // This is for back compat and will eventually be removed. |
| 151 | $unregistered = true; |
| 152 | check_admin_referer( 'update-options' ); |
| 153 | } else { |