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index.php(ʵÏÖÊäÈëÑéÖ¤ÂëÒ³Ãæ)´úÂëÈçÏ£º Code´úÂëÈçÏÂ: <html>
<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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