这是一段完美的php柱状图生成类代码,可以生成漂亮实用的柱状图,代码如下:

1. function createimage($data,$twidth,$tspace,$height){ 
2.                         $dataname = array(); 
3.                         $datavalue = array(); 
4.                         $i = 0; 
5.                         $j = 0; 
6.                         $k = 0; 
7.                         $num = sizeof($data); 
8.                          
9.                         foreach($data as $key => $val){ 
10.                                         $dataname[] = $key; 
11.                                         $datavalue[] = $val; 
12.                                 } 
13.          
14.                         $maxnum = max($data); 
15.                         $width = ($twidth + $tspace) * $num + 4;//image's width 
16.                         $im = imagecreate($width + 40,$height+20); 
17.                         $linecolor = imagecolorallocate($im,12,12,12); 
18.                         $bgcolor = imagecolorallocate($im,235,233,233); 
19.                         $tcolor = imagecolorallocate($im,123,200,56); 
20.                         imagefill($im,0,0,$bgcolor); 
21.                         imageline ( $im, 30, 0, 30, $height - 2, $linecolor); 
22.                         imageline ( $im, 30, $height - 2, $width + 30 -2 , $height - 2,$linecolor); 
23.                         while($i < $num){ 
24.                                 imagefilledrectangle ( $im, $i * ($tspace+$twidth) + 40, $height - $datavalue[$i], $i * ($tspace+$twidth) + 40 + $twidth, $height - 3, $tcolor); 
25.                                 imagestringup ( $im, 4, $i * ($tspace+$twidth) + $twidth/2 + 30, $height - 10, $dataname[$i]."(".$datavalue[$i].")", $linecolor); 
26.                                 $i++; 
27.                         } 
28.                         while($j <= (500/10)){ 
29.                                 imagestringup ( $im, 4, 2, $height - $j * 10 + 10, $j * 10, $linecolor); 
30.                                 $j = $j + 10; 
31.                         } 
32.                         while($k <= (500/10)){ 
33.                                 if($k != 0) 
34.                                 imageline ( $im, 28, $height - $k * 10, 32 , $height - $k * 10,$linecolor); 
35.                                 $k = $k + 10; 
36.                         }//开源代码phpfensi.com 
37.                         imagepng($im); 
38.                 } 

调用方法,代码如下:

1. header("content-type:image/png"); 
2. $data = array("yahoo" => 120, "google" => 260,"microsoft" => 320,"ibm" => 290,"sun system" => 150,"inter" => 260); 
3. createimage($data,38,25,460);  
4.  

原文链接：http://www.phpfensi.com/php/20140819/4485.html