PHP验证码类代码( 最新修改,完全定制化! )

时间:2022-09-16 20:12:43

Authnum.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 $im_height; 
private $len; 
//随机字符串、y轴坐标值、随机颜色 
private $randnum; 
private $y; 
private $randcolor; 
//背景色的红绿蓝,默认是浅灰色 
public $red=238; 
public $green=238; 
public $blue=238; 
/** 
* 可选设置:验证码类型、干扰点、干扰线、Y轴随机 
* 设为 false 表示不启用 
**/ 
//默认是大小写数字混合型,1 2 3 分别表示 小写、大写、数字型 
public $ext_num_type=''; 
public $ext_pixel = false; //干扰点 
public $ext_line = false; //干扰线 
public $ext_rand_y= true; //Y轴随机 
function __construct ($len=4,$im_width='',$im_height=25) { 
// 验证码长度、图片宽度、高度是实例化类时必需的数据 
$this->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 < $this->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 < 100; $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 < 2; $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 < $this->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(); 
?>