WordPress 怎么用自定义小工具（Widget ）开发?这是一段有详细注释的WordPress自定义小工具（Widget ）开发实例代码，可用于制作主题时集成自定义小工具，将代码添加到主题functions.php中。
- <?php/** * Add function to widgets_init that’ll load our widget. * @since 0.1 */add_action( ‘widgets_init’, ‘example_load_widgets’ );/** * Register our widget. * ‘Example_Widget’ is the widget class used below. * * @since 0.1 */function example_load_widgets() { register_widget( ‘Example_Widget’ );}/** * Example Widget class. * This class handles everything that needs to be handled with the widget: * the settings, form, display, and update. Nice! * * @since 0.1 */class Example_Widget extends WP_Widget { /** * Widget setup. */ function Example_Widget() { /* Widget settings. */ $widget_ops = array( ‘classname’ => ‘example’, ‘description’ => __(‘An example widget that displays a person’s name and sex.’, ‘example’) ); /* Widget control settings. */ $control_ops = array( ‘width’ => 300, ‘height’ => 350, ‘id_base’ => ‘example-widget’ ); /* Create the widget. */ $this->WP_Widget( ‘example-widget’, __(‘Example Widget’, ‘example’), $widget_ops, $control_ops ); } /** * How to display the widget on the screen. */ function widget( $args, $instance ) { extract( $args ); /* Our variables from the widget settings. */ $title = apply_filters(‘widget_title’, $instance[‘title’] ); $name = $instance[‘name’]; $sex = $instance[‘sex’]; $show_sex = isset( $instance[‘show_sex’] ) ? $instance[‘show_sex’] : false; /* Before widget (defined by themes). */ echo $before_widget; /* Display the widget title if one was input (before and after defined by themes). */ if ( $title ) echo $before_title . $title . $after_title; /* Display name from widget settings if one was input. */ if ( $name ) printf( ‘<p>’ . __(‘Hello. My name is %1$s.’, ‘example’) . ‘</p>’, $name ); /* If show sex was selected, display the user’s sex. */ if ( $show_sex ) printf( ‘<p>’ . __(‘I am a %1$s.’, ‘example.’) . ‘</p>’, $sex ); /* After widget (defined by themes). */ echo $after_widget; } /** * Update the widget settings. */ function update( $new_instance, $old_instance ) { $instance = $old_instance; /* Strip tags for title and name to remove HTML (important for text inputs). */ $instance[‘title’] = strip_tags( $new_instance[‘title’] ); $instance[‘name’] = strip_tags( $new_instance[‘name’] ); /* No need to strip tags for sex and show_sex. */ $instance[‘sex’] = $new_instance[‘sex’]; $instance[‘show_sex’] = $new_instance[‘show_sex’]; return $instance; } /** * Displays the widget settings controls on the widget panel. * Make use of the get_field_id() and get_field_name() function * when creating your form elements. This handles the confusing stuff. */ function form( $instance ) { /* Set up some default widget settings. */ $defaults = array( ‘title’ => __(‘Example’, ‘example’), ‘name’ => __(‘John Doe’, ‘example’), ‘sex’ => ‘male’, ‘show_sex’ => true ); $instance = wp_parse_args( (array) $instance, $defaults ); ?> <!– Widget Title: Text Input –> <p> <label for=“<?php echo $this->get_field_id( ‘title’ ); ?>”><?php _e(‘Title:’, ‘hybrid’); ?></label> <input id=“<?php echo $this->get_field_id( ‘title’ ); ?>” name=“<?php echo $this->get_field_name( ‘title’ ); ?>” value=“<?php echo $instance[‘title’]; ?>” style=“width:100%;” /> </p> <!– Your Name: Text Input –> <p> <label for=“<?php echo $this->get_field_id( ‘name’ ); ?>”><?php _e(‘Your Name:’, ‘example’); ?></label> <input id=“<?php echo $this->get_field_id( ‘name’ ); ?>” name=“<?php echo $this->get_field_name( ‘name’ ); ?>” value=“<?php echo $instance[‘name’]; ?>” style=“width:100%;” /> </p> <!– Sex: Select Box –> <p> <label for=“<?php echo $this->get_field_id( ‘sex’ ); ?>”><?php _e(‘Sex:’, ‘example’); ?></label> <select id=“<?php echo $this->get_field_id( ‘sex’ ); ?>” name=“<?php echo $this->get_field_name( ‘sex’ ); ?>” class=“widefat” style=“width:100%;”> <option <?php if ( ‘male’ == $instance[‘format’] ) echo ‘selected=“selected”‘; ?>>male</option> <option <?php if ( ‘female’ == $instance[‘format’] ) echo ‘selected=“selected”‘; ?>>female</option> </select> </p> <!– Show Sex? Checkbox –> <p> <input class=“checkbox” type=“checkbox” <?php checked( $instance[‘show_sex’], true ); ?> id=“<?php echo $this->get_field_id( ‘show_sex’ ); ?>” name=“<?php echo $this->get_field_name( ‘show_sex’ ); ?>” /> <label for=“<?php echo $this->get_field_id( ‘show_sex’ ); ?>”><?php _e(‘Display sex publicly?’, ‘example’); ?></label> </p> <?php }}?>
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