//输出文字
$fontColor
= ImageColorAllocate(
$im
, 48,61,50);
for
(
$i
=0;
$i
<
$rndcodelen
;
$i
++)
{
$bc
= mt_rand(0,1);
$rndstring
[
$i
] =
strtoupper
(
$rndstring
[
$i
]);
imagestring(
$im
, 5,
$i
*10+6, mt_rand(2,4),
$rndstring
[
$i
],
$fontColor
);
}
header("Pragma:no-cache/r/n");
header("Cache-Control:no-cache/r/n");
header("Expires:0/r/n");
//
输出特定类型的图片格式,优先级为 gif -> jpg ->png
if
(function_exists("imagejpeg"))
{
header("content-type:image/jpeg/r/n");
imagejpeg(
$im
);
}
else
{
header("content-type:image/png/r/n");
imagepng(
$im
);
}
ImageDestroy(
$im
);
exit
();
}
else
{
//不支持 GD
,只输出字母 ABCD
$_SESSION
['dd_ckstr'] = "abcd";
$_SESSION
['dd_ckstr_last'] = '';
header("content-type:image/jpeg/r/n");
header("Pragma:no-cache/r/n");
header("Cache-Control:no-cache/r/n");
header("Expires:0/r/n");
$fp
=
fopen
("data/vdcode.jpg","r");
echo
fread
(
$fp
,
filesize
("data/vdcode.jpg"));
fclose(
$fp
);
exit
();
}
?>