$lineColor1
= ImageColorAllocate(
$im
,
mt_rand(174,218),mt_rand(190,225),mt_rand(217,237));
for
(
$j
=1;
$j
<=2;
$j
=
$j
+3)
{
imageline(
$im
,0,
$j
+mt_rand(1,15),48,
$j
+mt_rand(1,15),
$lineColor1
);
}
//输出文字
$fontColor
= ImageColorAllocate(
$im
, mt_rand(0,150),mt_rand(0,150),mt_rand(0,150));
for
(
$i
=0;
$i
<
$rndcodelen
;
$i
++)
{
$bc
= mt_rand(0,1);
$rndstring
[
$i
] =
strtoupper
(
$rndstring
[
$i
]);
imagestring(
$im
,mt_rand(3,5),
$i
*
$img_height
/4+mt_rand(1,5),mt_rand(1,
$img_width
/2),
$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("imagepng"))