實現圖片驗證碼類 PHP

最後更新：2017-08-22 來源：互聯網

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標籤：rds click str edit generator type arc onclick 文字

封裝一個圖片驗證碼類

<?phpclass Captcha{    private $img;    private $imgX;    private $imgY;    private $codeNum;    private $code;    private $str="abcdefghjklmnpqrstuvwxyz123456789ABCDEFGHJKLMNPQRSTUVWXYZ";    public function __construct($imgX=80,$imgY=40,$codeNum=4){        $this->imgX=$imgX;        $this->imgY=$imgY;        $this->codeNum=$codeNum;    }    public function printImg(){        $this->createBg();        $this->getCode();        $this->setCode();        $this->setDot();        $this->setCurve();        $this->outImg();    }    //建立畫布背景圖片    private function createBg(){        //建立畫布        $this->img=imagecreate($this->imgX,$this->imgY);        //給圖片背景顏色分配        imagecolorallocate($this->img,243,251,254);    }    //輸出背景圖片    private function outImg(){        header("Content-type:image/jpeg");        imagejpeg($this->img);    }    //產生驗證碼    private function getCode(){        //產生驗證碼        for($i=0;$i<$this->codeNum;$i++){            $key=rand(0,strlen($this->str)-1);            $this->code.=$this->str[$key];        }        $this->setSession();    }        //產生背景圖片和文字顏色    private function setCode(){        for($i=0;$i<$this->codeNum;$i++){            $char_color=imagecolorallocate($this->img,rand(0,255),rand(0,255),rand(0,255));            $font_size=rand(3,5);            $font_height=imagefontheight($font_size);//根據設定的字型大小擷取字型高度            $x=($this->imgX/$this->codeNum)*$i;//設定驗證碼每個字的座標位置            $y=rand(0,$this->imgY-$font_height-3);            imagechar($this->img,$font_size,$x,$y,$this->code{$i},$char_color);//把字串寫到圖片上  imagechar()        }    }    //畫幹擾點    private function setDot(){        for($i=0;$i<=50;$i++){            $dot_color=imagecolorallocate($this->img,rand(0,255),rand(0,255),rand(0,255));            imagesetpixel($this->img,rand(1,80),rand(1,40),$dot_color);//把幹擾點寫到圖片上  imagesetpixel()        }    }    //畫幹擾線    private function setCurve(){        for($i=0;$i<=3;$i++){            $line_color=imagecolorallocate($this->img,rand(0,255),rand(0,255),rand(0,255));            imagearc($this->img,rand(1,$this->imgX),rand(1,$this->imgY),100,80,30,15,$line_color);        }    }    //把驗證碼儲存到session    private function setSession(){        session_start();        $_SESSION[‘code‘]=strtolower($this->code);    }}$captcha=new Captcha;$captcha->printImg();

在外部調用類

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> <head>  <title> new document </title>  <meta name="generator" content="editplus" />  <meta name="author" content="" />  <meta name="keywords" content="" />  <meta name="description" content="" />  <meta charset="utf-8"> </head> <body> <label>請輸入驗證碼：</label><input type="text"><img src="captcha.php" onclick="this.src=‘captcha.php?‘+Math.random()" /> </body></html>

實現圖片驗證碼類 PHP

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