随机生成数字，字母的代码：
//che.php
session_start();
for($i=0;$i
{
$rand.=dechex(rand(1,15));
}
$_SESSION['check_num']=$rand;
$image=imagecreatetruecolor(50,30);
$bg=imagecolorallocate($im,0,0,0);//第一次用调色板的时候，背景颜色
$te=imagecolorallocate($im,255,255,255);
imagestring($image,6,rand(0,20),rand(0,2),$rand,$te);
ob_clean();//PHP网页中因为 要生成验证码而出现 图像"http://localhost/**.php"因其本身有错无法显示
header("Content-type:image/jpeg"); imagejpeg($image);
?>
给图片画出干扰线代码：
for($i=0;$i
{
$cg=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));//产生随机的颜色
imageline($im,rand(10,40),0,rand(10,40),20,$cg);
}
给图片画出干扰点的代码：
for($i=0;$i
{
imagesetpixel($im,rand(0,40),rand(0,20),$cg);
}
把文字写入图片代码：
$str=array('我','我','亲','亲');//存储显示的汉字
for($i=0;$i
{
$sss.=$str[rand(0,3)];//随机显示汉字
}
//$str=iconv("gb2312","utf-8",$str); //汉字编码转化，我的好像不需要
imagettftext($im,10,0,rand(5,60),rand(5,60),$te,"simhei.ttf",$sss);//
0:字体的倾斜度，“simhei.ttf”:字体样式，一般放在根目录下；
摘自 ms.元
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