<?php
/**
* 这个类用于生成验证码图像, 同时可以对用户输入的验证码进行验证
*
* @author ♂bingo↗ [coolhpy@163.com]
* @since 2006-6-17
* @modify feifengxlq <feifengxlq@gmail.com> http://www.phpobject.net/blog
* @modify 2006-11-9
* 修改说明
*/
class authcode
{
/**
* 验证码
* char: 字符
* angle: 字符偏移的角度 (-30 <= angle <= 30)
* color: 字符颜色
*
* @var array
* @access private
*/
var $code = array();
/**
* 字体信息
* space: 字符间隔 (px)
* size: 字体大小 (px)
* left: 第一个字符距离图像最左边的象素 (px)
* top: 字符距离图像最上边的象素 (px)
* file: 字体文件的路径
*
* @var array
* @access private
*/
var $font = array();
/**
* 图像信息
* type: 图像类型
* mime: MIME 类型
* width: 图像的宽 (px)
* height: 图像高 (px)
* func: 创建图像的方法
*
* @var array
* @access private
*/
var $image = array();
/**
* 干扰信息
* type: 干扰类型 (false 表示不使用)
* density: 干扰密度
*
* @var array
* @access private
*/
var $molestation = array();
/**
* 背景色 (RGB)
* r: 红色 (0 - 255)
* g: 绿色 (0 - 255)
* b: 蓝色 (0 - 255)
*
* @var array
* @access private
*/
var $bg_color = array();
/**
* 默认前景色 (RGB)
* r: 红色 (0 - 255)
* g: 绿色 (0 - 255)
* b: 蓝色 (0 - 255)
*
* @var array
* @access private
*/
var $fg_color = array();
var $authcode='';
/**
* 构造函数，初始化各变量
*
* @access public
*/
function __construct()
{
$this->setCode();
$this->setMolestation();
$this->setImage();
$this->setFont();
$this->setBgColor();
}
/**
* 获取产生的authcode
*/
function getcode()
{
return $this->authcode;
}
/**
* 绘制图像
*
* @access public
* @param string 文件名, 留空表示输出到浏览器
* @return void
*/
function paint($filename='')
{
// 创建图像
$im = imagecreatetruecolor($this->image['width'],
$this->image['height']);
// 设置图像背景
$bg_color = imagecolorallocate($im, $this->bg_color['r'],
$this->bg_color['g'],
$this->bg_color['b']);
imagefilledrectangle($im, 0, 0, $this->image['width'],
$this->image['height'], $bg_color);
// 生成验证码相关信息
$code = $this->generateCode();
// 向图像中写入字符
$num = count($code);
$current_left = $this->font['left'];
$current_top = $this->font['top'];
for ($i=0; $i<$num; $i++)
{
$font_color = imagecolorallocate($im, $code[$i]['color']['r'],$code[$i]['color']['g'],$code[$i]['color']['b']);
imagettftext($im, $this->font['size'], $code[$i]['angle'],
$current_left, $current_top, $font_color,
$this->font['file'], $code[$i]['char']);
$current_left += $this->font['size'] + $this->font['space'];
$the_code .= $code[$i]['char'];
}
$this->authcode=$the_code;//保存authcode
// 绘制图像干扰
$this->paintMolestation($im);
// 输出
if (isset($filename) && $filename!='')
{
$this->image['func']($im, $filename.$this->image['type']);
} else
{
header("Cache-Control: no-cache, must-revalidate");
header("Content-type: ".$this->image['mime']);
$this->image['func']($im);
}
imagedestroy($im);
}
/**
* 生成随机验证码
*
* @access private
* @return array 生成的验证码
*/
function generateCode()
{
// 创建允许的字符串
$characters = explode(',', $this->code['characters']);
$num = count($characters);
for ($i=0; $i<$num; $i++)
{
if (substr_count($characters[$i], '-') > 0)
{
$character_range = explode('-', $characters[$i]);
for ($j=ord($character_range[0]); $j<=ord($character_range[1]);
$j++)
{
$array_allow[] = chr($j);
}
}
else
{
$array_allow[] = $array_allow[$i];
}
}
$index = 0;
while (list($key, $val) = each($array_allow))
{
$array_allow_tmp[$index] = $val;
$index ++;
}
$array_allow = $array_allow_tmp;
// 生成随机字符串
mt_srand((double)microtime() * 1000000);
$code = array();
$index = 0;
$i = 0;
while ($i < $this->code['length'])
{
$index = mt_rand(0, count($array_allow) - 1);
$code[$i]['char'] = $array_allow[$index];
if ($this->code['deflect'])
{
$code[$i]['angle'] = mt_rand(-30, 30);
} else
{
$code[$i]['angle'] = 0;
}
if ($this->code['multicolor'])
{
$code[$i]['color']['r'] = mt_rand(0, 255);
$code[$i]['color']['g'] = mt_rand(0, 255);
$code[$i]['color']['b'] = mt_rand(0, 255);
} else
{
$code[$i]['color']['r'] = $this->fg_color['r'];
$code[$i]['color']['g'] = $this->fg_color['g'];
$code[$i]['color']['b'] = $this->fg_color['b'];
}
$i++;
}
return $code;
}
/**
* 获取图像类型
*
* @access private
* @param string 扩展名
* @return [mixed] 错误时返回 false
*/
function getImageType($extension)
{
switch (strtolower($extension))
{
case 'png':
$information['mime'] = image_type_to_mime_type(IMAGETYPE_PNG);
$information['func'] = 'imagepng';
break;
case 'gif':
$information['mime'] = image_type_to_mime_type(IMAGETYPE_GIF);
$information['func'] = 'imagegif';
break;
case 'wbmp':
$information['mime'] = image_type_to_mime_type(IMAGETYPE_WBMP);
$information['func'] = 'imagewbmp';
break;
case 'jpg':
$information['mime'] = image_type_to_mime_type(IMAGETYPE_JPEG);
$information['func'] = 'imagejpeg';
break;
case 'jpeg':
$information['mime'] = image_type_to_mime_type(IMAGETYPE_JPEG);
$information['func'] = 'imagejpeg';
break;
case 'jpe':
$information['mime'] = image_type_to_mime_type(IMAGETYPE_JPEG);
$information['func'] = 'imagejpeg';
break;
default:
$information = false;
}
return $information;
}
/**
* 绘制图像干扰
*
* @access private
* @param resource 图像资源
* @return void
*/
function paintMolestation(&$im)
{
// 总象素
$num_of_pels = ceil($this->image['width']*$this->image['height']/5);
switch ($this->molestation['density'])
{
case 'fewness':
$density = ceil($num_of_pels / 3);
break;
case 'muchness':
$density = ceil($num_of_pels / 3 * 2);
break;
case 'normal':
$density = ceil($num_of_pels / 2);
default:
}
switch ($this->molestation['type'])
{
case 'point':
$this->paintPoints($im, $density);
break;
case 'line':
$density = ceil($density / 30);
$this->paintLines($im, $density);
break;
case 'both':
$density = ceil($density / 2);
$this->paintPoints($im, $density);
$density = ceil($density / 30);
$this->paintLines($im, $density);
break;
default:
break;
}
}
/**
* 画点
*
* @access private
* @param resource 图像资源
* @param int 图像资源
* @return void
*/
function paintPoints(&$im, $quantity)
{
mt_srand((double)microtime()*1000000);
for ($i=0; $i<$quantity; $i++)
{
$randcolor = imagecolorallocate($im, mt_rand(0,255),
mt_rand(0,255), mt_rand(0,255));
imagesetpixel($im, mt_rand(0, $this->image['width']),
mt_rand(0, $this->image['height']), $randcolor);
}
}
/**
* 画线
*
* @access private
* @param resource 图像资源
* @param int 图像资源
* @return void
*/
function paintLines(&$im, $quantity)
{
mt_srand((double)microtime()*1000000);
for ($i=0; $i<$quantity; $i++)
{
$randcolor = imagecolorallocate($im, mt_rand(0,255),
mt_rand(0,255), mt_rand(0,255));
imageline($im, mt_rand(0, $this->image['width']),
mt_rand(0, $this->image['height']),
mt_rand(0, $this->image['width']),
mt_rand(0, $this->image['height']), $randcolor);
}
}
/**
* 设置前景色
*
* @access private
* @param array RGB 颜色
* @return void
*/
function setFgColor($color)
{
if (is_array($color) && is_integer($color['r']) &&
is_integer($color['g']) && is_integer($color['b']) &&
($color['r'] >= 0 && $color['r'] <= 255) &&
($color['g'] >= 0 && $color['g'] <= 255) &&
($color['b'] >= 0 && $color['b'] <= 255))
{
$this->fg_color = $color;
} else
{
$this->fg_color = array('r'=>0,'g'=>0,'b'=>0);
}
}
/**
* 设置验证码
*
* @access public
* @param array 字符信息
* characters string 允许的字符
* length int 验证码长度
* deflect boolean 字符是否偏转
* multicolor boolean 字符是否彩色
* @return void
*/
function setCode($code='')
{
if (is_array($code))
{
if (!isset($code['characters']) || !is_string($code['characters']))
{
$code['characters'] = '0-9';
}
if (!(is_integer($code['length']) || $code['length']<=0))
{
$code['length'] = 4;
}
if (!is_bool($code['deflect']))
{
$code['deflect'] = true;
}
if (!is_bool($code['multicolor']))
{
$code['multicolor'] = true;
}
} else
{
$code = array('characters'=>'0-9', 'length'=>4,
'deflect'=>true, 'multicolor'=>false);
}
$this->code = $code;
}
/**
* 设置背景色
*
* @access public
* @param array RGB 颜色
* @return void
*/
function setBgColor($color='')
{
if (is_array($color) && is_integer($color['r']) &&
is_integer($color['g']) && is_integer($color['b']) &&
($color['r'] >= 0 && $color['r'] <= 255) &&
($color['g'] >= 0 && $color['g'] <= 255) &&
($color['b'] >= 0 && $color['b'] <= 255))
{
$this->bg_color = $color;
} else
{
$this->bg_color = array('r'=>255,'g'=>255,'b'=>255);
}
// 设置默认的前景色, 与背景色相反
$fg_color = array(
'r'=>255-$this->bg_color['r'],
'g'=>255-$this->bg_color['g'],
'b'=>255-$this->bg_color['b']
);
$this->setFgColor($fg_color);
}
/**
* 设置干扰信息
*
* @access public
* @param array 干扰信息
* type string 干扰类型 (选项: false, 'point', 'line')
* density string 干扰密度 (选项: 'normal', 'muchness', 'fewness')
* @return void
*/
function setMolestation($molestation='')
{
if (is_array($molestation))
{
if (!isset($molestation['type']) ||
($molestation['type']!='point' &&
$molestation['type']!='line' &&
$molestation['type']!='both'))
{
$molestation['type'] = 'point';
}
if (!is_string($molestation['density']))
{
$molestation['density'] = 'normal';
}
$this->molestation = $molestation;
} else
{
$this->molestation = array(
'type' => 'point',
'density' => 'normal'
);
}
}
/**
* 设置字体信息
*
* @access public
* @param array 字体信息
* space int 字符间隔 (px)
* size int 字体大小 (px)
* left int 第一个字符距离图像最左边的象素 (px)
* top int 字符距离图像最上边的象素 (px)
* file string 字体文件的路径
* @return void
*/
function setFont($font='')
{
if (is_array($font))
{
if (!is_integer($font['space']) || $font['space']<0)
{
$font['space'] = 5;
}
if (!is_integer($font['size']) || $font['size']<0)
{
$font['size'] = 12;
}
if (!is_integer($font['left']) || $font['left']<0 ||
$font['left']>$this->image['width'])
{
$font['left'] = 5;
}
if (!is_integer($font['top']) || $font['top']<0 ||
$font['top']>$this->image['height'])
{
$font['top'] = $this->image['height'] - 5;
}
if (!file_exists($font['file']))
{
$font['file'] = './arial.ttf';
}
$this->font = $font;
} else
{
$this->font = array('space'=>5, 'size'=>12, 'left'=>5,
'top'=>15,
'file'=>'./arial.ttf');
}
}
/**
* 设置图像信息
*
* @access public
* @param array 图像信息
* type string 图像类型 (选项: 'png', 'gif', 'wbmp', 'jpg')
* width int 图像宽 (px)
* height int 图像高 (px)
* @return void
*/
function setImage($image='')
{
if (is_array($image))
{
if (!is_integer($image['width']) || $image['width'] <= 0)
{
$image['width'] = 70;
}
if (!is_integer($image['height']) || $image['height'] <= 0)
{
$image['height'] = 20;
}
$this->image = $image;
$information = $this->getImageType($image['type']);
if (is_array($information))
{
$this->image['mime'] = $information['mime'];
$this->image['func'] = $information['func'];
} else
{
$this->image['type'] = 'png';
$information = $this->getImageType('png');
$this->image['mime'] = $information['mime'];
$this->image['func'] = $information['func'];
}
} else{
$information = $this->getImageType('png');
$this->image = array(
'type'=>'png',
'mime'=>$information['mime'],
'func'=>$information['func'],
'width'=>70,
'height'=>20);
}
}
}
?>
