Need a simple SQL Query

Alright, there is something called cleaner.php which can help me but I don't know what codes to input :

<?php

if (function_exists('set_time_limit') AND get_cfg_var('safe_mode')==0)

{

	@set_time_limit(0);

}


ignore_user_abort(true);

error_reporting(E_ALL  & ~E_NOTICE);

/*

* @package 		ImpEx.tools

* @version		$Revision: 1826 $

* @author		Jerry Hutchings <jerry.hutchings@vbulletin.com>

* @checkedout	$Name$

* @date 		$Date: 2007-08-21 14:03:19 -0700 (Tue, 21 Aug 2007) $

* @copyright 	http://www.vbulletin.com/license.html

*

*/

// BACK UP YOUR DATABASE

// Cleaner

// Swaps X for Y in the database handy for smilies that have been wrongly parsed

// BACK UP YOUR DATABASE

//

########################################

#

#	Set to true / false

# $do_posts 		= ALL POSTS

# $do_sigs 			= ALL SIGNATURES

# $do_thread_titles = ALL THREAD TITLES

# $do_pm_text		= ALL PM TEXTS;

# $do_pm_text_title	= ALL PM TITLES;

########################################

// BACK UP YOUR DATABASE

// Set to true to run, and false when done, or remove this script (and all of impex when finished).

$active				= true;


// Set true or false as to the data you want to clean

$do_posts			= true;

$do_sigs			= false;

$do_thread_titles	= false;

$do_pm_text			= false;

$do_pm_text_title	= false;

########################################


[B]# Replace 'Find me' and "Replace with me" with the strings  you want replaced i.e

# "<b>"			=> "[b]"

# "<blockquote>" 	=> "[quote]"

# add as many elements to the array as needed


// BACK UP YOUR DATABASE

$replacer = array(

			""	=> "",

			""	=> "",

			""	=> "",

			""	=> "",

			""	=> ""

);


// BACK UP YOUR DATABASE[/B]


################################################################################

# CHANGE NOTHING BELOW THIS LINE # CHANGE NOTHING BELOW THIS LINE # CHANGE NOTHI

################################################################################

if (!$active)

{

	exit('Not active');

}

define('IDIR', (($getcwd = getcwd()) ? $getcwd : '.'));

include_once('./../db_mysql.php');

// BACK UP YOUR DATABASE

require_once ('./../ImpExConfig.php');


$targetserver 		= $impexconfig['target']['server'];

$targetuser			= $impexconfig['target']['user'];

$targetpassword		= $impexconfig['target']['password'];

$targetdatabase 	= $impexconfig['target']['database'];

$targettableprefix 	= $impexconfig['target']['tableprefix'];

$targettablecharset	= $impexconfig['target']['charset'];


$Db_target = new DB_Sql_vb_impex();

$Db_target->appname      	= 'vBulletin:ImpEx Target';

$Db_target->appshortname 	= 'vBulletin:ImpEx Target';

$Db_target->type			= 'mysql';

$Db_target->database     	= $targetdatabase;


$Db_target->connect($targetserver, $targetuser, $targetpassword, 0, $targettablecharset);

$Db_target->select_db($targetdatabase);

// BACK UP YOUR DATABASE


# Posts

if($do_posts)

{

	$posts = $Db_target->query("SELECT postid, pagetext, title FROM " . $targettableprefix . "post");


	while ($post = $Db_target->fetch_array($posts))

	{

		$text = str_replace(array_keys($replacer), $replacer, $post['pagetext']);

		$title_text = str_replace(array_keys($replacer), $replacer, $post['title']);

		#$text = preg_replace('##siU', '', $text);

		#$title_text = preg_replace('##siU', '', $text);

		$Db_target->query("UPDATE " . $targettableprefix . "post SET pagetext='" . addslashes($text) . "', title='" . addslashes($title_text) . "' WHERE postid='" . $post['postid'] . "'");

		echo "<br /><b>Post done -></b><i> " . $post['postid'] . "</i>";

	}

}


# Signatures

if($do_sigs)

{

	$users = $Db_target->query("SELECT userid, signature FROM " . $targettableprefix . "usertextfield");


	while ($user = $Db_target->fetch_array($users))

	{

		$text = str_replace(array_keys($replacer), $replacer, $user['signature']);

		#$text = preg_replace('##siU', '', $text);

		$Db_target->query("UPDATE " . $targettableprefix . "usertextfield SET signature='" . addslashes($text) . "' WHERE userid='" . $user['userid'] . "'");

		echo "<br /><b>Signature done -></b><i> " . $user['userid'] . "</i>";

	}

}


# Thread titles

if($do_thread_titles)

{

	$users = $Db_target->query("SELECT threadid, title FROM " . $targettableprefix . "thread");


	while ($user = $Db_target->fetch_array($users))

	{

		$text = str_replace(array_keys($replacer), $replacer, $user['title']);

		#$text = preg_replace('##siU', '', $text);

		$Db_target->query("UPDATE " . $targettableprefix . "thread SET title='" . addslashes($text) . "' WHERE threadid='" . $user['threadid'] . "'");

		echo "<br /><b>Thread done -></b><i> " . $user['threadid'] . "</i> :: <b>{$text}</b>";

	}

}


# PM text

if($do_pm_text)

{

	$pms = $Db_target->query("SELECT pmtextid, message, title FROM " . $targettableprefix . "pmtext");


	while ($pm = $Db_target->fetch_array($pms))

	{

		$text = str_replace(array_keys($replacer), $replacer, $pm['message']);

		$title = str_replace(array_keys($replacer), $replacer, $pm['title']);

		#$text = preg_replace('##siU', '', $text);

		$Db_target->query("UPDATE " . $targettableprefix . "pmtext SET message='" . addslashes($text) . "', title='" . addslashes($title) . "' WHERE pmtextid='" . $pm['pmtextid'] . "'");

		echo "<br /><b>Pm done -></b><i> " . $pm['pmtextid'] . "</i> :: <b>{$text}</b>";

	}

}


// BACK UP YOUR DATABASE

// You shouldn't be reading down here !!

?>