PHP generate histogram example code

/*PHP生成柱状图*/
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;
}

 $maxnum = max($data);
 $width = ($twidth + $tspace) * $num + 4;//image's width
 $im = imagecreate($width + 40,$height+20);
 $lineColor = imagecolorallocate($im,12,12,12);
 $bgColor = imagecolorallocate($im,255,233,233);
 $tColor = imagecolorallocate($im,123,200,56);
 imagefill($im,0,0,$bgColor);
 imageline ( $im, 30, 0, 30, $height - 2, $lineColor);
 imageline ( $im, 30, $height - 2, $width + 30 -2 , $height - 2,$lineColor);
  while($i      imagefilledrectangle ( $im, $i * ($tspace+$twidth) + 40, $height - $dataValue[$i], $i * ($tspace+$twidth) + 40 + $twidth, $height - 3, $tColor);
     imagestringup ( $im, 4, $i * ($tspace+$twidth) + $twidth/2 + 30, $height - 10, $dataName[$i]."(".$dataValue[$i].")", $lineColor);
     $i++;
  }
  while($j      imagestringup ( $im, 4, 2, $height - $j * 10 + 10, $j * 10, $lineColor);
     $j = $j + 10;
  }
  while($k       if($k != 0)
     imageline ( $im, 28, $height - $k * 10, 32 , $height - $k * 10,$lineColor);
     $k = $k + 10;
  }
 imagepng($im);
}
//柱状图调用方法
header("content-type:image/png");
$data = array("Yahoo" => 140, "Google" => 200,"Microsoft" => 120,"IBM" => 80,"Sun System" => 350,"Inter" => 20);
将这行中数据改成你的即可：$data = array("Yahoo" => 100, "Google" => 260,"Microsoft" =>  320,"IBM" => 250,"Sun System" => 150,"Inter" => 220);
createImage($data,50,25,500);
?>

柱状图，如下：