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PHP版的验证码程序

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2016-05-22 18:35:481362browse

//生成验证码图片
Header("Content-type: image/PNG");
srand((double)microtime()*1000000);//播下一个生成随机数字的种子,以方便下面随机数生成的使用

session_start();//将随机数存入session中
$_SESSION['authnum']="";
$im = imagecreate(62,20); //制定图片背景大小

$black = ImageColorAllocate($im, 0,0,0); //设定三种颜色
$white = ImageColorAllocate($im, 255,255,255);
$gray = ImageColorAllocate($im, 200,200,200);

imagefill($im,0,0,$gray); //采用区域填充法,设定(0,0)

while(($authnum=rand()0000)//将四位整数验证码绘入图片
$_SESSION['authnum']=$authnum;
imagestring($im, 5, 10, 3, $authnum, $black);
// 用 col 颜色将字符串 s 画到 image 所代表的图像的 x,y 座标处(图像的左上角为 0, 0)。
//假如 font 是 1,2,3,4 或 5,则使用内置字体

for($i=0;$i{
$randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($im, rand()p , rand()0 , $randcolor);
}


ImagePNG($im);
ImageDestroy($im);
?>

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