class Verify
{
//宽度
protected $width;
//高度
protected $height;
//类型
protected $type;
//长度
protected $length = 4;
//验证码
protected $code;
//图片资源
protected $image;
public static function yzm($width=100,$height=40,$length=4,$type=0)
{
$v = new Verify($width,$height,$length,$type);
$v->output();
return $v->getLastCode();
}
public function __get($propertyName)
{
if ($propertyName == 'code') {
return $this->code;
}
return false;
}
public function getLastCode()
{
return $this->code;
}
public function __construct($width=200,$height=50,$length=4,$type=0)
{
$this->width = $width;
$this->height = $height;
if ($length >= 3 || $length <= 10) {
$this->length = $length;
}
$this->type = $type;
}
public function output()
{
$this->createImage();
$this->setVerifyCode();
$this->setDisturb();
$this->sendImage();
}
//创建画布并设置浅色背景
protected function createImage()
{
$this->image = imagecreatetruecolor($this->width, $this->height);
$lightColor = $this->getColor(true);
imagefill($this->image, 0, 0, $lightColor);
}
protected function setVerifyCode()
{
//产生验证码字符串
$this->code = $this->randString();
//将验证码画到画布上
$fontSize = $this->height / 2;
$perWidth = $this->width / $this->length;
$delta = ($perWidth - $fontSize) / 2;
$offsetY = ($this->height + $fontSize) / 2;
for ($i=0; $i < $this->length; $i++) {
//提取一个字符
$ch = mb_substr($this->code, $i, 1);
$color = $this->getColor();
$angle = mt_rand(-30,30);
$offsetX = $i * $perWidth + $delta;
//画到画布上
imagettftext($this->image, $fontSize, $angle, $offsetX, $offsetY, $color, '../../../../public/fonts/lxkmht.ttf', $ch);
}
}
protected function setDisturb()
{
$total = $this->width * $this->height / 50;
for ($i=0; $i < $total; $i++) {
$x = mt_rand(0, $this->width-1);
$y = mt_rand(0, $this->height-1);
$color = $this->getColor();
imagesetpixel($this->image, $x, $y, $color);
}
}
protected function sendImage()
{
header('Content-Type:image/png');
imagepng($this->image);
imagedestroy($this->image);
}
protected function getColor($isLight=false)
{
$start = (int)$isLight * 128;
$end = $start + 127;
$red = mt_rand($start,$end);
$green = mt_rand($start,$end);
$blue = mt_rand($start,$end);
return imagecolorallocate($this->image, $red, $green, $blue);
}
protected function randString()
{
switch ($this->type) {
case 0://纯数字
$str = $this->randNumber();
break;
case 1://纯字母
$str = $this->randAlpha();
break;
case 2://数字字母混合
$str = $this->randMixed();
break;
case 3://中文
$str = $this->randChinese();
break;
default://未知
$str = $this->randUnknow();
break;
}
return $str;
}
protected function randNumber()
{
$str = '1234567890';
return substr(str_shuffle($str), 0, $this->length);
}
protected function randAlpha()
{
$arr = range('a', 'z');
$str = join('', $arr);
$str .= strtoupper($str);
return substr(str_shuffle($str), 0, $this->length);
}
protected function randMixed()
{
$str = '';
for ($i=0; $i < $this->length; $i++) {
$type = mt_rand(0, 2);
switch ($type) {
case 0://数字
$str .= chr(mt_rand(ord('0'), ord('9')));
break;
case 1://小写字母
$str .= chr(mt_rand(ord('a'), ord('z')));
break;
case 2://大写字母
$str .= chr(mt_rand(ord('A'), ord('Z')));
break;
}
}
return $str;
}
protected function randChinese()
{
$str = '';
for ($i=0; $i < $this->length; $i++) {
$ch1 = mt_rand(176,214);
$ch2 = mt_rand(161,254);
$str .= chr($ch1) . chr($ch2);
}
return iconv('gbk', 'utf-8', $str);
}
protected function randUnknow()
{
$ch = rand(0,9);
$arr = array_fill(0, $this->length, $ch);
return join('', $arr);
}
}
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