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<head>
<title>check code</title>
</head>
<body>
<form name=check method=post action=check.php>
<input type=hidden name=init value=1>
ÑéÖ¤Â룺<input type=text name=code maxlength=4 style="width=50px;">
<!--µÃµ½ÑéÖ¤ÂëͼƬ-->
<img src=image.php>
<p>
<input type=submit value="Ìá½»">
</form>
</body>
</html> image.php£¨ÑéÖ¤ÂëÉú³ÉÒ³Ã棩´úÂëÈçÏ£º Code´úÂëÈçÏÂ: <?php
session_start();
srand((double)microtime()*1000000);
$authnum=rand(1000,9999);
session_register("authnum");
header("content-type:image/png");
function creat_image( $width, $height, $authnum)
{
srand((double)microtime()*1000000);
$im = imagecreate( $width, $height);
$black = ImageColorAllocate( $im, 0,0,0);
$white = ImageColorAllocate( $im, 255,255,255);
$gray = ImageColorAllocate( $im, 200,200,200);
imagefill( $im,0,0, $gray);
//½«ËÄλÕûÊýÑéÖ¤Âë»æÈëͼƬ
imag
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