authnum.class.php 下载
复制代码 代码如下:
len = $len; $im_width = $len * 15;
$this->im_width = $im_width;
$this->im_height= $im_height;
$this->im = imagecreate($im_width,$im_height);
}
// 设置图片背景颜色，默认是浅灰色背景
function set_bgcolor () {
imagecolorallocate($this->im,$this->red,$this->green,$this->blue);
}
// 获得任意位数的随机码
function get_randnum () {
$an1 = 'abcdefghijklmnopqrstuvwxyz';
$an2 = 'abcdefghijklmnopqrstuvwxyz';
$an3 = '0123456789';
if ($this->ext_num_type == '') $str = $an1.$an2.$an3;
if ($this->ext_num_type == 1) $str = $an1;
if ($this->ext_num_type == 2) $str = $an2;
if ($this->ext_num_type == 3) $str = $an3;
for ($i = 0; $i len; $i++) {
$start = rand(1,strlen($str) - 1);
$randnum .= substr($str,$start,1);
}
$this->randnum = $randnum;
$_session[an] = $this->randnum;
}
// 获得验证码图片y轴
function get_y () {
if ($this->ext_rand_y) $this->y = rand(5, $this->im_height/5);
else $this->y = $this->im_height / 4 ;
}
// 获得随机色
function get_randcolor () {
$this->randcolor = imagecolorallocate($this->im,rand(0,100),rand(0,150),rand(0,200));
}
// 添加干扰点
function set_ext_pixel () {
if ($this->ext_pixel) {
for($i = 0; $i $this->get_randcolor();
imagesetpixel($this->im, rand()%100, rand()%100, $this->randcolor);
}
}
}
// 添加干扰线
function set_ext_line () {
if ($this->ext_line) {
for($j = 0; $j $rand_x = rand(2, $this->im_width);
$rand_y = rand(2, $this->im_height);
$rand_x2 = rand(2, $this->im_width);
$rand_y2 = rand(2, $this->im_height);
$this->get_randcolor();
imageline($this->im, $rand_x, $rand_y, $rand_x2, $rand_y2, $this->randcolor);
}
}
}
/**创建验证码图像：
* 建立画布（__construct函数）
* 设置画布背景（$this->set_bgcolor();）
* 获取随机字符串（$this->get_randnum ();）
* 文字写到图片上（imagestring函数）
* 添加干扰点/线（$this->set_ext_line(); $this->set_ext_pixel();）
* 输出图片
**/
function create () {
$this->set_bgcolor();
$this->get_randnum ();
for($i = 0; $i len; $i++){
$font = rand(4,6);
$x = $i/$this->len * $this->im_width + rand(1, $this->len);
$this->get_y();
$this->get_randcolor();
imagestring($this->im, $font, $x, $this->y, substr($this->randnum, $i ,1), $this->randcolor);
}
$this->set_ext_line();
$this->set_ext_pixel();
header(content-type:image/png);
imagepng($this->im);
imagedestroy($this->im); //释放图像资源
}
}//end class
/**使用验证码类的方法：
* $an = new authnum(验证码长度,图片宽度,图片高度);
* 实例化时不带参数则默认是四位的60*25尺寸的常规验证码图片
* 表单页面检测验证码的方法，对比 $_session[an] 是否等于 $_post[验证码文本框id]
* 可选配置：
* 1.验证码类型：$an->ext_num_type=1; 值为1是小写类型，2是大写类型，3是数字类型
* 2.干扰点：$an->ext_pixel = false; 值为false表示不添加干扰点
* 3.干扰线：$an->ext_line = false; 值为false表示不添加干扰线
* 4.y轴随机：$an->ext_rand_y = false; 值为false表示不支持图片y轴随机
* 5.图片背景：改变 $red $green $blue 三个成员变量的值即可
**/
$an = new authnum();
$an->ext_num_type='';
$an->ext_pixel = true; //干扰点
$an->ext_line = false; //干扰线
$an->ext_rand_y= true; //y轴随机
$an->green = 238;
$an->create();
?>
http://www.bkjia.com/phpjc/322609.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/322609.htmltecharticleauthnum.class.php 下载 复制代码 代码如下: ?php session_start(); class authnum { //图片对象、宽度、高度、验证码长度 private $im; private $im_width; private...