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* Date: 2007.03
* ¼¼ÊõÖ§³Ö£º www.17php.com
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$num="";
for($i=0;$i<4;$i++){
$num .= rand(0,9);
}
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Session_start();
$_SESSION["Checknum"] = $num;
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Header("Content-type: image/PNG");
srand((double)microtime()*1000000);
$im = imagecreate(60,20);
$black = ImageColorAllocate($im, 0,0,0);
$gray = ImageColorAllocate($im, 200,200,200);
imagefill($im,0,0,$gray);
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$style = array($black, $black, $black, $black, $black, $gray, $gray, $gray, $gray, $gray);
imagesetstyle($im, $style);
$y1=rand(0,20);
$y2=rand(0,20);
$y3=rand(0,20);
$y4=rand(0,20);
imageline($im,
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/**
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