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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 |
|---|---|
| 257 | // We echo out a form where 'number' can be set later |
| 258 | $this->_set('__i__'); |
| 259 | $instance = array(); |
| 260 | } else { |
| 261 | $this->_set($widget_args['number']); |
| 262 | $instance = $all_instances[ $widget_args['number'] ]; |
| 263 | } |
| 264 | |
| 265 | // filters the widget admin form before displaying, return false to stop displaying it |
| 266 | $instance = apply_filters('widget_form_callback', $instance, $this); |
| 267 | |
| 268 | $return = null; |
| 269 | if ( false !== $instance ) { |
| 270 | $return = $this->form($instance); |
| 271 | // add extra fields in the widget form - be sure to set $return to null if you add any |
| 272 | // if the widget has no form the text echoed from the default form method can be hidden using css |
| 273 | do_action_ref_array( 'in_widget_form', array(&$this, &$return, $instance) ); |
| 274 | } |
| 275 | return $return; |