PHP 柱形統計圖的實現程式碼

效果圖：

複製程式碼 程式碼如下:

<?php

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

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

$dataname = array();

$datavalue = array();//data裡面的值

$i = 0;

$j = 0;

$k = 0;

$num = sizeof($data);

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

$dataname[] = $key;

$datavalue[] = $val;

}

$width = $num * ($twidth + $tspace) + 20 ;//獲取影象的'寬度

$im = imagecreate($width,$height);//建立影象

$bgcolor = imagecolorallocate($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);//線的顏色

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

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

while($i< $num){

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

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

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

$i ++;

}

while($j < 400/10){

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

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

$j = $j +10;

}

imagejpeg($im);

}

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

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

?>