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       /*   ÍøÕ¾ÑéÖ¤Âë³ÌÐò
        *   ÔËÐл·¾³£º PHP5.0.18 ϵ÷ÊÔͨ¹ý
        *   ÐèÒª gd2 ͼÐοâÖ§³Ö£¨PHP.INIÖÐ php_gd2.dll¿ªÆô£©
        *   ÎļþÃû: showimg.php
        *   ×÷Õߣº  17php.com
        *   Date:   2007.03
        *   ¼¼ÊõÖ§³Ö£º www.17php.com
        */
       //Ëæ»úÉú³ÉÒ»¸ö4λÊýµÄÊý×ÖÑéÖ¤Âë
        $num="";
        for($i=0;$i<4;$i++){
        $num .= rand(0,9);
        }
       //4λÑéÖ¤ÂëÒ²¿ÉÒÔÓÃrand(1000,9999)Ö±½ÓÉú³É
       //½«Éú³ÉµÄÑéÖ¤ÂëдÈësession£¬±¸ÑéÖ¤Ò³ÃæÊ¹ÓÃ
        Session_start();
        $_SESSION["Checknum"] = $num;
       //´´½¨Í¼Æ¬£¬¶¨ÒåÑÕɫֵ
        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);
        //Ëæ»ú»æÖÆÁ½ÌõÐéÏߣ¬Æð¸ÉÈÅ×÷ÓÃ
        $style = array($black, $black, $black, $b


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