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<?php
header("Content-Type:image/png");
srand((double)microtime()*1000000);
$img_height=20;
$img_width=60;
$im=@imagecreate($img_width,$img_height) or die("²»Äܳõʼ»¯GDÎļþÁ÷");
$background_color=imagecolorallocate($im,255,255,255);
$text_color=imagecolorallocate($im,233,14,91);
//»æÖƸÉÈÅÑ©»¨
for($i=1;$i<=100;$i++)
{
imagestring($im,1,mt_rand(1,$img_width),mt_rand(1,$img_height),"*",imageColorAllocate($im,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)));
}
while(($num=rand()%100000)<10000);
//½«Ëæ¼´²úÉúµÄÑéÖ¤Âë±£´æÔÚsessionÖУ¬·½±ãÒÔºóʹÓÃ
//session_start();
$_SESSION["num"]=null;//ÑéÖ¤ÂëË¢ÐÂ
$_SESSION["num"]=$num;
//»æÖÆ×Ö·û´Óµ½Í¼Ïñ
imagestring($im,4,15,2,$num,$text_color);
imagepng($im);
imagedestroy($im);
?>


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