Delete Them All Plugin for WordPress

delete-them-all.php

<?php
/**
 * Plugin Name: Delete Them All!
 * Plugin URI: http://infomedia.com
 * Description: Delete ALL posts and associated data, leaving your database nice and clean!
 * Version: 1.0
 * Author: Brian DiChiara
 * Author URI: http://www.briandichiara.com
 */

define('DTA_VERSION', '1.0');
define('DTA_PI_NAME', 'Delete Them All!');
define('DTA_PI_DESCRIPTION', 'Delete ALL posts and associated data, leaving your database nice and clean!');
define('DTA_OPT_PREFIX', 'dta_');
define('DTA_PATH', plugin_dir_path( __FILE__ ));
define('DTA_DIR', plugin_dir_url( __FILE__ ));

add_action('admin_init', 'dta_admin_init');

/**
 * dta_admin_init()
 * 
 * @return void
 */
function dta_admin_init(){
	dta_delete_them_all();
	add_action('restrict_manage_posts', 'dta_link');
}

/**
 * dta_link()
 * 
 * @return void
 */
function dta_link(){
	global $typenow, $current_user;
	get_currentuserinfo();
	
	if($current_user->allcaps['delete_posts'] === true){
		$post_type = isset($_REQUEST['post_type']) ? $_REQUEST['post_type'] : $typenow;
		if($post_type && have_posts()){
			echo '<style type="text/css">.button.delete-them-all { margin-right:5px; }</style>';
			echo '<script type="text/javascript">jQuery(function($){$(\'.delete-them-all\').click(function(){ var count = $(\'.displaying-num:first\').text(); var conf = confirm(\'Are you sure you want to delete ALL \'+count+\'? There is no undo.\'); return conf;}); });</script>';
			echo '<a href="'.add_query_arg(array('delete-them-all' => $post_type), admin_url('edit.php')).'" class="button delete-them-all">'.__('Delete Them All!', 'delete-them-all').'</a>';
		}
	}
}


/**
 * dta_delete_them_all()
 * 
 * @return void
 */
function dta_delete_them_all(){
	if(isset($_REQUEST['delete-them-all']) && $_REQUEST['delete-them-all']){
		global $wpdb, $current_user;
		get_currentuserinfo();
		
		if($current_user->allcaps['delete_posts'] === true){
			set_time_limit(120);
			
			$post_type = $_REQUEST['delete-them-all'];
			if($post_type){
				$post_type_object = get_post_type_object( $post_type );
				
				$deleted = 0;
				$post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT `ID` FROM $wpdb->posts WHERE post_type=%s", $post_type ) );
				
				foreach($post_ids as $post_id){
					if ( !current_user_can($post_type_object->cap->delete_post, $post_id) )
						wp_die( __('You are not allowed to delete this item.') );
						
					if ( !wp_delete_post($post_id) )
						wp_die( __('Error in deleting...') );
					
					$deleted++;
				}
			}
		}
			
		$args = array('post_type' => $post_type);
		if($deleted){
			$args['deleted'] = $deleted;
		}
		$redirect = add_query_arg($args, admin_url('edit.php'));
		
		wp_redirect($redirect);
		exit();
	}
}