Add plugin; Add README

README.md

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+# WordPress DB Cleaner #
+
+A very simple plugin that lets you clean up tables left over from previous deleted sites on a multisite installation. 
+While WordPress will delete the tables it creates for a new site, tables created by plugins will remain.
+
+This plugin adds a page under tools. In the textfield on this page, a list of site IDs can be given. The plugin will go through and delete all the tables that contain that ID.
+
+Multiple IDs can be given my comma seperating them.
+
+# License # 
+
+MIT License. A copy can be found in the root of this repository.

db-cleaner.php

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+<?php
+/*
+Plugin Name: DB Cleaner
+ */
+
+
+add_action('wp_ajax_my_action', 'remove_site_tables_for_id');
+function remove_site_tables_for_id() {
+	global $wpdb;
+	$raw_ids = explode(",", $_POST['id'] );
+	$ids = array();
+	foreach($raw_ids as $id) {
+		array_push($ids, intval(trim($id)));
+	}
+	$dbname = $wpdb->dbname;
+
+	$data = array();
+	foreach($ids as $id) {
+		$sql = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME like '%_\_" . $id . "\__%' and TABLE_SCHEMA = '$dbname'";
+		$table_names = $wpdb->get_results($sql);
+		foreach($table_names as $key => $row) {
+			array_push($data, $row->TABLE_NAME);
+			$query = "DROP TABLE IF EXISTS $row->TABLE_NAME";
+			$wpdb->query($query);
+		}
+	}
+	echo join(":", $data);
+	wp_die();
+}
+
+function myplugin_admin_page(){
+		?>
+	<script>
+	function delete_tables() {
+		var data = {
+			'action': 'my_action',
+			'id' : jQuery('#tableids').val()      // We pass php values differently!
+	};
+		console.log(data);
+		jQuery.post(ajaxurl, data, function(response) {
+			var rows = response.split(":");
+			jQuery("#tables_found").empty();
+			for (var i = 0; i < rows.length; i++ ) {
+				console.log(rows[i]);
+				jQuery("#tables_found").append("<li>" + rows[i] + "</li>");
+			}
+		});
+	}
+
+	</script>
+	<div class="wrap">
+		<h2>DB Cleaner</h2>
+		<input id="tableids" type="text">
+		<button onclick="delete_tables()">Delete Tables</button>
+	</div>
+	<div class="wrap">
+		<ul id="tables_found">
+
+		</ul>
+	</div>
+	<?php
+}
+
+function register_pages() {
+	add_management_page('DB Cleaner', 'DB Cleaner', 'manage_options','db-cleaner', 'myplugin_admin_page');
+}
+
+add_action("admin_menu", "register_pages");