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PHP验证码处理源代码

Jun 06, 2016 pm 07:40 PM
php deal with Safety letter source code verify

?php /** * 安全的 验证 码要: 验证 码文字扭曲、旋转,使用不同字体,添加干扰码。 * @原作者: 流水孟春 cmpan@qq.com * @修 改: flymorn www.piaoyi.org **/ class YL_Security_Secoder { // 验证 码的session的下标 public static $seKey = 'verify_py

/**
* 安全的验证码要:验证码文字扭曲、旋转,使用不同字体,添加干扰码。
* @原作者: 流水孟春
* @修 改: flymorn
**/
class YL_Security_Secoder {
//验证码的session的下标
public static $seKey = 'verify_py'; //验证码关键字
public static $expire = 3000; // 验证码过期时间(s)
//验证码中使用的字符,01IO容易混淆,不用
public static $codeSet = '3456789ABCDEFGHJKLMNPQRTUVWXY';
public static $fontSize = 26; // 验证码字体大小(px)
public static $useCurve = true; // 是否画混淆曲线
public static $useNoise = true; // 是否添加杂点
public static $imageH = 0; // 验证码图片宽
public static $imageL = 0; // 验证码图片长
public static $length = 4; // 验证码位数
public static $bg = array(243, 251, 254); // 背景

protected static $_image = null; // 验证码图片实例
protected static $_color = null; // 验证码字体颜色

/**
* 输出验证码并把验证码的值保存的session中
*/
public static function entry() {
// 图片宽(px)
self::$imageL || self::$imageL = self::$length * self::$fontSize * 1.5 + self::$fontSize*1.5;
// 图片高(px)
self::$imageH || self::$imageH = self::$fontSize * 2;
// 建立一幅 self::$imageL x self::$imageH 的图像
self::$_image = imagecreate(self::$imageL, self::$imageH);
// 设置背景
imagecolorallocate(self::$_image, self::$bg[0], self::$bg[1], self::$bg[2]);
// 验证码字体随机颜色
self::$_color = imagecolorallocate(self::$_image, mt_rand(1,120), mt_rand(1,120), mt_rand(1,120));
// 验证码使用随机字体,保证目录下有这些字体集
$ttf = dirname(__FILE__) . '/ttfs/t' . mt_rand(1, 10) . '.ttf';

if (self::$useNoise) {
// 绘杂点
self::_writeNoise();
}
if (self::$useCurve) {
// 绘干扰线
self::_writeCurve();
}

// 绘验证
$code = array(); // 验证
$codeNX = 0; // 验证码第N个字符的左边距
for ($i = 0; $i<:> $code[$i] = self::$codeSet[mt_rand(0, 28)];
$codeNX += mt_rand(self::$fontSize*1.2, self::$fontSize*1.6);
// 写一个验证码字符
imagettftext(self::$_image, self::$fontSize, mt_rand(-40, 70), $codeNX, self::$fontSize*1.5, self::$_color, $ttf, $code[$i]);
}

// 保存验证
isset($_SESSION) || session_start();
$_SESSION[self::$seKey]['code'] = join('', $code); // 把验证码保存到session, 验证时注意是大写
$_SESSION[self::$seKey]['time'] = time(); // 验证码创建时间

header('Pragma: no-cache');
header("content-type: image/JPEG");

// 输出图像
imageJPEG(self::$_image);
imagedestroy(self::$_image);
}

/**
* 画一条由两条连在一起构成的随机正弦函数曲线作干扰线(你可以改成更帅的曲线函数)
* 正弦型函数解析式:y=Asin(ωx+φ)+b
* 各常数值对函数图像的影响:
* A:决定峰值(即纵向拉伸压缩的倍数)
* b:表示波形在Y轴的位置关系或纵向移动距离(上加下减)
* φ:决定波形与X轴位置关系或横向移动距离(左加右减)
* ω:决定周期(最小正周期T=2π/∣ω∣)
*/
protected static function _writeCurve() {
$A = mt_rand(1, self::$imageH/2); // 振幅
$b = mt_rand(-self::$imageH/4, self::$imageH/4); // Y轴方向偏移量
$f = mt_rand(-self::$imageH/4, self::$imageH/4); // X轴方向偏移量
$T = mt_rand(self::$imageH*1.5, self::$imageL*2); // 周期
$w = (2* M_PI)/$T;

$px1 = 0; // 曲线横坐标起始位置
$px2 = mt_rand(self::$imageL/2, self::$imageL * 0.667); // 曲线横坐标结束位置
for ($px=$px1; $px if ($w!=0) {
$py = $A * sin($w*$px + $f)+ $b + self::$imageH/2; // y = Asin(ωx+φ) + b
$i = (int) ((self::$fontSize - 6)/4);
while ($i > 0) {
imagesetpixel(self::$_image, $px + $i, $py + $i, self::$_color);
//这里画像素点比imagettftext和imagestring性能要好很多
$i--;
}
}
}

$A = mt_rand(1, self::$imageH/2); // 振幅
$f = mt_rand(-self::$imageH/4, self::$imageH/4); // X轴方向偏移量
$T = mt_rand(self::$imageH*1.5, self::$imageL*2); // 周期
$w = (2* M_PI)/$T;
$b = $py - $A * sin($w*$px + $f) - self::$imageH/2;
$px1 = $px2;
$px2 = self::$imageL;
for ($px=$px1; $px if ($w!=0) {
$py = $A * sin($w*$px + $f)+ $b + self::$imageH/2; // y = Asin(ωx+φ) + b
$i = (int) ((self::$fontSize - 8)/4);
while ($i > 0) {
imagesetpixel(self::$_image, $px + $i, $py + $i, self::$_color);
//这里(while)循环画像素点比imagettftext和imagestring用字体大小一次画出
//的(不用while循环)性能要好很多
$i--;
}
}
}
}

/**
* 画杂点
* 往图片上写不同颜色的字母或数字
*/
protected static function _writeNoise() {
for($i = 0; $i //杂点颜色
$noiseColor = imagecolorallocate(
self::$_image,
mt_rand(150,225),
mt_rand(150,225),
mt_rand(150,225)
);
for($j = 0; $j // 绘杂点
imagestring(
self::$_image,
5,
mt_rand(-10, self::$imageL),
mt_rand(-10, self::$imageH),
self::$codeSet[mt_rand(0, 28)], // 杂点文本为随机的字母或数字
$noiseColor
);
}
}
}
}

//调用上面定义的验证码类 来生产验证
YL_Security_Secoder::$useNoise = true; //是否启用噪点
YL_Security_Secoder::$useCurve = true; //是否启用干扰曲线
YL_Security_Secoder::entry();

?>

 

还有一个tts的文件夹用于放字体文件

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