主页 > php >

php验证码类

2020-05-05
class Code
{
	//验证码个数
	protected $number;
	//验证码类型
	protected $codeType;
	//图像宽度
	protected $width;
	//图像高度
	protected $height;
	//图像资源
	protected $image;
	//验证码字符串
	protected $code;
	
	public function __construct($number = 4,$codeType=2,$width=100,$height=50)
	{
		//初始化自己的成员属性
		$this->number = $number;
		$this->codeType = $codeType;
		$this->width = $width;
		$this->height = $height;

		//生成验证码函数
		$this->code = $this->createCode();
	}


	//析构方法
	public function __destruct(){
		imagedestroy($this->image);
	}

	public function __get($name){
		if($name == 'code'){
			return $this->code;
		}
		return false;
	}

	protected function createCode(){
		//通过验证码类型生成不同的验证码
		//0:纯数字
		//1:纯字母
		//2:字母数字组合
		switch ($this->codeType) {
			case 0:
				$code = $this->getNumberCode();
				break;
			case 1:
				$code = $this->getCharCode();
				break;
			case 2:
				$code = $this->getNumCharCode();
				break;
			default:
				exit("不支持这种验证码类型");
		}
		return $code;
	}

	protected function getNumberCode(){
		$str = join('',range(0,9));
		return substr(str_shuffle($str), 0,$this->number);
	}

	protected function getCharCode(){
		$str = join('',range('a','z'));
		$str = $str.strtoupper($str);
		return substr(str_shuffle($str), 0,$this->number);
	}

	protected function getNumCharCode(){
		$numStr = join('',range(0,9));
		$str = join('',range('a','z'));
		$str = $numStr.$str.strtoupper($str);
		return substr(str_shuffle($str),0,$this->number);
	}

	//创建画布
	protected function creatImage(){
		$this->image =imagecreatetruecolor($this->width, $this->height);
	}

	//填充背景色
	protected function fillBack(){
		imagefill($this->image, 0, 0, $this->lightColor());
	}

	//生成随机浅色
	protected function lightColor(){
		return imagecolorallocate($this->image, mt_rand(130,255), mt_rand(130,255), mt_rand(130,255));
	}

	//生成随机深色
	protected function darkColor(){
		return imagecolorallocate($this->image, mt_rand(0,120), mt_rand(0,120), mt_rand(0,120));
	}

	//将验证码字符串画到画布中
	protected function drawChar(){
		$width = ceil($this->width / $this->number);
		for($i=0;$i<$this->number;$i++){
			$x = mt_rand($i*$width+5,($i+1)*$width-15);
			$y = mt_rand(0,$this->height-15);
			imagechar($this->image,5,$x,$y,$this->code[$i],$this->darkColor());
		}
	}

	//干扰元素
	protected function drawDisturb(){
		for ($i=0; $i <150 ; $i++) { 
			$x = mt_rand(0,$this->width);
			$y = mt_rand(0,$this->height);
			imagesetpixel($this->image, $x, $y, $this->lightColor());
		}
	}

	//输出显示
	protected function show(){
		header('Content-Type:image/png');
		imagepng($this->image);
	}

	public function outImage(){
		//创建画布
		$this->creatImage();
		//填充背景色
		$this->fillBack();
		//将验证码字符串画到画布中
		$this->drawChar();
		//添加干扰元素
		$this->drawDisturb();
		//输出并且显示
		$this->show();
	}
}
下一篇:没有了
分享到:
  • 收藏
    相关阅读