從資料庫中讀出的$x, $y, $z為何不能產生圖形呢

從資料庫中讀出的$x, $y, $z為什麼不能產生圖形呢

require("../Comm/Conn.php"); //從資料庫讀取資料部分
$result = mysqli_query($mysql, "select count(*) as nega from message where attitude=-1");
$row = mysqli_fetch_assoc($result);
$x=(int)$row['nega'];
$result = mysqli_query($mysql, "select count(*) as zero from message where attitude=0");
$row = mysqli_fetch_assoc($result);
$y=(int)$row['zero'];
$result = mysqli_query($mysql, "select count(*) as posi from message where attitude=1");
$row = mysqli_fetch_assoc($result);
$z=(int)$row['posi'];
mysqli_free_result($result);
mysqli_close($mysql);


$total=$x+$y+$z; //產生統計圖部分
$height=200;
$width=200;

$y1=$height-intval($x/$total*$height,10);
$y2=$height-intval($y/$total*$height,10);
$y3=$height-intval($z/$total*$height,10);

$im=imagecreatetruecolor($width,$height);
$white=imagecolorallocate($im,255,255,255);
$black=imagecolorallocate($im,0,0,0);
$red=imagecolorallocate($im,255,0,0);
$blue=imagecolorallocate($im,0,0,255);
$green=imagecolorallocate($im,0,255,0);

imagefill($im,0,0,$white);
imagerectangle($im,0,0,$width-1,$height-1,$black);
imagefilledrectangle($im,$width/10,$y1,3*$width/10,$height-2,$red);
imagefilledrectangle($im,4*$width/10,$y2,6*$width/10,$height-2,$blue);
imagefilledrectangle($im,7*$width/10,$y3,9*$width/10,$height-2,$green);

imagestring($im,5,30,180,$x,$white);
imagestring($im,5,90,180,$y,$white);
imagestring($im,5,150,180,$z,$red);

Header('Content-type:image/png');
imagepng($im);
imagedestroy($im);
?>

------解決方案--------------------
輸出 $x $y $z看看是什嗎？還是你的sql有問題？
------解決方案--------------------
Header('Content-type:image/png');
header小寫
------解決方案--------------------
如果你的 #1、#2的補充說明是真實的，那麼
1、去掉 Conn.php 檔案中最後的 ?>
2、確認兩個檔案均沒有 BOM 頭
3、確認 $x+$y+$z != 0
------解決方案--------------------
那就比較怪異了，注釋掉 header 看看
//Header('Content-type:image/png');
------解決方案--------------------
$s = file_get_contents('http://www.yisee.org/00Home/Messagegraph.php');
print_r(unpack('H*', $s));

得到
Array ( [1] => efbbbf89504e470d0a1a0a0000000d49484452000000c8000000c80802....

這個 efbbbf 不就是 BOM 頭嗎？你怎麼說沒有呢？

