英文同数字
- <?php
- Header("Content-type:image/png");
- //定义header,声明图片文件,最好是png,无版权之扰;
- //生成新的四位整数验证码
- session_start();//开启session;
- $authnum_session = '';
- $str = 'abcdefghijkmnpqrstuvwxyz1234567890';
- //定义用来显示在图片上的数字和字母;
- $l = strlen($str); //得到字串的长度;
- //循环随机抽取四位前面定义的字母和数字;
- for($i=1;$i<=4;$i++)
- {
- $num=rand(0,$l-1);
- //每次随机抽取一位数字;从第一个字到该字串最大长度,
- //减1是因为截取字符是从0开始起算;这样34字符任意都有可能排在其中;
- $authnum_session.= $str[$num];
- //将通过数字得来的字符连起来一共是四位;
- }
- session_register("authnum_session");
- //用session来做验证也不错;注册session,名称为authnum_session,
- //其它页面只要包含了该图片
- //即可以通过$_SESSION["authnum_session"]来调用
- //生成验证码图片,
- srand((double)microtime()*1000000);
- $im = imagecreate(50,20);//图片宽与高;
- //主要用到黑白灰三种色;
- $black = ImageColorAllocate($im, 0,0,0);
- $white = ImageColorAllocate($im, 255,255,255);
- $gray = ImageColorAllocate($im, 200,200,200);
- //将四位整数验证码绘入图片
- imagefill($im,68,30,$gray);
- //如不用干扰线,注释就行了;
- $li = ImageColorAllocate($im, 220,220,220);
- for($i=0;$i<3;$i++)
- {//加入3条干扰线;也可以不要;视情况而定,因为可能影响用户输入;
- imageline($im,rand(0,30),rand(0,21),rand(20,40),rand(0,21),$li);
- }
- //字符在图片的位置;
- imagestring($im, 5, 8, 2, $authnum_session, $white);
- for($i=0;$i<90;$i++)
- {//加入干扰象素
- imagesetpixel($im, rand()%70 , rand()%30 , $gray);
- }
- ImagePNG($im);
- ImageDestroy($im);
- ?>
中文
<?php
/*
* 文件:code.php
* 作用:验证码生成
*/
session_start();
// 设置 content-type
header("Content-type: image/png");
// 创建图片
$im = imagecreatetruecolor(120, 30);
$ChineseChar = array("人","出","来","友","学","孝","仁","义","礼","廉","忠","国","中","易","白","者","火 ","土","金","木","雷","风","龙","虎","天","地",
"生","晕","菜","鸟","田","三","百","钱","福 ","爱","情","兽","虫","鱼","九","网","新","度","哎","唉","啊","哦","仪","老","少","日",
"月 ","星");
// 创建颜色
$fontcolor = imagecolorallocate($im, 255, 255, 255);
$bg = imagecolorallocate($im, 0, 0, 0);
// 设置文字
for($i=0;$i<4;$i++) $text .= $ChineseChar[(array_rand($ChineseChar))];
$_SESSION['code'] = $text;
// 设置字体 [url]http://www.font.com.cn/downlist/s_12_3.html[/url] 有_GBK系列的字体下载,一般GD库都支持的!
$font = 'gbk.ttf';
// 添加文字
imagettftext($im, 18, 0, 11, 21, $fontcolor, $font, iconv("GB2312","UTF-8",$text));
// 输出图片
imagepng($im);
imagedestroy($im);
?>