<?
/*PHP100精华：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 < $num){
        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 <= (500/10)){
        imagestringup ( $im, 4, 2, $height - $j * 10 + 10, $j * 10, $lineColor);
        $j = $j + 10;
     }
     while($k <= (500/10)){
         if($k != 0)
        imageline ( $im, 28, $height - $k * 10, 32 , $height - $k * 10,$lineColor);
        $k = $k + 10;
     }
    imagepng($im);
}

header("content-type:image/png");
$data = array("Yahoo" => 100, "Google" => 260,"Microsoft" => 320,"IBM" => 250,"Sun System" => 150,"Inter" => 220);
createImage($data,50,25,600);//createImage($data,宽，间隔，高);
?>