PHP生成柱状图实例代码

3. /*PHP生成柱状图*/

4. function createImage($data,$twidth,$tspace,$height){
5. $dataName = array();
6. $dataValue = array();
7. $i = 0;
8. $j = 0;
9. $k = 0;
10. $num = sizeof($data);

11. foreach($data as $key => $val){

12. $dataName[] = $key;
13. $dataValue[] = $val;
14. }
16. $maxnum = max($data);
17. $width = ($twidth + $tspace) * $num + 4;//image's width
18. $im = imagecreate($width + 40,$height+20);
19. $lineColor = imagecolorallocate($im,12,12,12);
20. $bgColor = imagecolorallocate($im,255,233,233);
21. $tColor = imagecolorallocate($im,123,200,56);
22. imagefill($im,0,0,$bgColor);
23. imageline ( $im, 30, 0, 30, $height - 2, $lineColor);
24. imageline ( $im, 30, $height - 2, $width + 30 -2 , $height - 2,$lineColor);
25. while($i < $num){
26. imagefilledrectangle ( $im, $i * ($tspace+$twidth) + 40, $height - $dataValue[$i], $i * ($tspace+$twidth) + 40 + $twidth, $height - 3, $tColor);
27. imagestringup ( $im, 4, $i * ($tspace+$twidth) + $twidth/2 + 30, $height - 10, $dataName[$i]."(".$dataValue[$i].")", $lineColor);
28. $i++;
29. }
30. while($j <= (500/10)){
31. imagestringup ( $im, 4, 2, $height - $j * 10 + 10, $j * 10, $lineColor);
32. $j = $j + 10;
33. }
34. while($k <= (500/10)){
35. if($k != 0)
36. imageline ( $im, 28, $height - $k * 10, 32 , $height - $k * 10,$lineColor);
37. $k = $k + 10;
38. }
39. imagepng($im);
40. }

41. //柱状图调用方法

42. header("content-type:image/png");
43. $data = array("Yahoo" => 140, "Google" => 200,"Microsoft" => 120,"IBM" => 80,"Sun System" => 350,"Inter" => 20);
44. 将这行中数据改成你的即可：$data = array("Yahoo" => 100, "Google" => 260,"Microsoft" => 320,"IBM" => 250,"Sun System" => 150,"Inter" => 220);
45. createImage($data,50,25,500);
46. ?>

柱状图，如下：