Photo Credit Widget

photo-credit-widget.php

<?php
/*
Plugin Name: Photo Credit Widget
Description: Displays photo credit only on pages without custom header images
Version: 1.0
Author URI: http://ben.balter.com/
*/

class BB_Photo_Credit_Widget extends WP_Widget {

	function __construct(){
		
		parent::__construct();
		
		$widget_ops = array('classname' => 'photo-credit', 'description' => 'Displays photo credit only on pages without custom header images' );
    	$this->WP_Widget( 'BB_Photo_Credit_Widget', 'Photo Credit', $widget_ops);
		
	}

	function widget($args, $instance) {
	  
	    extract($args, EXTR_SKIP);
		global $post;
 
	  	echo $before_widget;

		if ( !is_singular() || !has_post_thumbnail( $post->ID ) )
			echo $instance['content'];
					
		echo $after_widget;
		
	}
	
	function form( $instance ) {
		$instance = wp_parse_args((array) $instance, array( 'title' => '' ) );
    	$content = $instance['content'];
	?>
  <p><label for="<?php echo $this->get_field_id('content'); ?>">Content: <input class="widefat" id="<?php echo $this->get_field_id('content'); ?>" name="<?php echo $this->get_field_name('content'); ?>" type="text" value="<?php echo attribute_escape( $content ); ?>" /></label></p>
<?php
	}
	
	function update( $new_instance, $old_instance ) {
	    
	    $instance = $old_instance;
    	$instance['content'] = $new_instance['content'];
    	return $instance;
	
	}
	
}

add_action( 'widgets_init', create_function('', 'return register_widget("BB_Photo_Credit_Widget");') );