PHP 柱形统计图的实现代码

效果图：

复制代码 代码如下:

<?php

function createImage($data,$twidth,$tspace,$height){

header("Content-Type:image/jpeg");

$dataname = array();

$datavalue = array();//data里面的`值

$i = 0;

$j = 0;

$k = 0;

$num = sizeof($data);

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

$dataname[] = $key;

$datavalue[] = $val;

}

$width = $num * ($twidth + $tspace) + 20 ;//获取图像的宽度

$im = imagecreate($width,$height);//创建图像

$bgcolor = imagecolorallocate($im,255,255,255);//背景色

$jcolor = imagecolorallocate($im,255,255,0);//矩形的背景色

$acolor = imagecolorallocate($im,0,0,0);//线的颜色

imageline($im,25,$height-20,$width-5,$height -20,$acolor);//X轴

imageline($im,25,$height-20,25,2,$acolor);//Y轴

while($i< $num){

imagefilledrectangle($im,$i*($tspace+$twidth)+40,$height-$datavalue[$i]-20,$i*($twidth+$tspace)+$tspace+40,$height-20,$jcolor);//画矩形

imagestring($im,3,$i*($tspace+$twidth)+40+$twidth/2,$height-$datavalue[$i]-35,$datavalue[$i],$acolor);//在柱子上面写出值

imagestring($im,3,$i*($tspace+$twidth)+40+$twidth/2,$height-15,$dataname[$i],$acolor);//在柱子下面写出值

$i ++;

}

while($j < 400/10){

imageline($im,25,($height-20)-$j*8,28,($height-20)-$j*8,$acolor);//画出刻度

imagestring($im,2,5,($height-30)-$j*8,$j*10,$acolor);//标出刻度值

$j = $j +10;

}

imagejpeg($im);

}

$data =array("1"=>25,"2"=>30,"3" =>21 );

createImage($data,40,40,300);

?>