php 柱状图

<?php
//״ͼ
//http://www.codefans.net
//
function createImage($data,$twidth,$tspace,$height){
                        $dataName = array();
                        $dataValue = array();
                        $i = 0;
                        $j = 0;
                        $k = 0;
                        $num = sizeof($data);
                       
                        foreach($data as $key => $val){
                                        $dataName[] = $key;
                                        $dataValue[] = $val;
                     &nbs