php驗證碼

標籤：rectangle   back   cst   div   驗證碼   ima   span   for   pixel   

<?phpsession_start();function random($len){    $srcstr = "1a2s3d4f5g6hj8k9l0qwertyuiopzxcvbnm";    mt_srand();    $strs = "";    for($i=0;$i<$len;$i++){        $strs.= $srcstr[mt_rand(0,10)];    }    return $strs;}$str = random(4);$width = 50;$height = 25;@header("Content-Type:image/png");$im = imagecreate($width,$height);$back = imagecolorallocate($im,0xFF,0xFF,0xFF);$font = imagecolorallocate($im,41,163,238);$pix = imagecolorallocate($im,187,230,247);mt_srand();for($i=0;$i<1000;$i++){    imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$pix);}imagestring($im,5,7,5,$str,$font);imagerectangle($im,0,0,$width-1,$height-1,$font);imagepng($im);imagedestroy($im);$str=md5($str);setcookie("authcode",$str,time()+3600,"/");?>

 

php驗證碼