为提高网站安全性,登陆采用验证码是必不可少的。一款简单精致的PHP验证码应运而生!此验证码简洁美观,源码简单,可以自定义修改样式,是一款不错的验证码。
实现代码:
//将验证码保存到session里,供全局使用
session_start();
$nums = "";
for($i=0;$i //产生随机数并转换成十六进制
$nums.=dechex(mt_rand(0,15));
}
//将验证码写入session
$_SESSION['code']=$nums;
//设置验证码长和宽
$_width = 60;
$_height = 20;
//创建一张图片
$_img = imagecreatetruecolor($_width,$_height);
//创建一个白色
$_white = imagecolorallocate($_img,220,250,250);
//填充背景
imagefill($_img,0,0,$_white);
//随机画6条线条
for($i=0;$i $_rnd_color = imagecolorallocate($_img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imageline($_img,mt_rand(0,$_width),mt_rand(0,$_width),mt_rand(0,$_width),mt_rand(0,$_width),$_rnd_color);
}
//随机画出雪花
for($i=0;$i imagestring($_img,1,mt_rand(1,$_width),mt_rand(1,$_height),"*",imagecolorallocate($_img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)));
}
//输出验证码
for($i=0;$i
}
//输出和销毁
header("Content-Type:image/png");
imagepng($_img);
imagedestroy($_img);
?>

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