php验证码工具类

骑猪看日落 2022-06-05 08:44 279阅读 0赞

完整下载地址：[http://download.csdn.net/download/qq\_36316736/10129125][http_download.csdn.net_download_qq_36316736_10129125]

<?php
    class Code{
         
        //随机因子
        private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';
        //验证码
        private $code;
        //验证码长度
        private $codeLen = 4;
        //图片宽度
        private $width = 130;
        //图片高度
        private $height = 50;
        //图片
        private $img;
        //ttf字体
        private $font;
        //字体大小
        private $fontSize = 20;
        //字体颜色
        private $fontColor;
        //线条间隔
        private $lineSpace = 10;
        //星号数量
        private $asteriskNum = 20;
        //构造函数
        public function __construct()
        {
         
            $this->font = __DIR__ . '\Solomon.ttf';
        }
        //生成验证码
        private function createCode(){
         
            $_len = strlen($this->charset);
            for($i = 0;$i < $this->codeLen;$i++){
                $this->code .= $this->charset[mt_rand(0,$_len-1)];
            }
        }
        //生成背景图片
        private function createBg(){
         
            $this->img = imagecreatetruecolor($this->width,$this->height);
            $color = imagecolorallocate($this->img,mt_rand(157,255),mt_rand(157,255),mt_rand(157,255));
            imagefilledrectangle($this->img,0,0,$this->width,$this->height,$color);
        }
        //验证码写入图片
        private function createFont(){
         
            $_x = $this->width / $this->codeLen;
            for($i = 0;$i<$this->codeLen;$i++){
                $this->fontColor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
                imagettftext($this->img,$this->fontSize,mt_rand(-30,30),$_x*$i + mt_rand(3,5),$this->height/1.4,$this->fontColor,$this->font,$this->code[$i]);
            }
        }
        //干扰线条和星号
        private function createLine(){
         
            $_x = $this->width / $this->lineSpace;
            $_y = $this->height / $this->lineSpace;
            for($i = 0;$i < $_x;$i++){
                $color = imagecolorallocate($this->img,200,200,200);
                imageline($this->img,$this->lineSpace * $i,0,$this->lineSpace * $i,$this->height,$color);
            }
            for ($i = 0;$i<$_y;$i++){
                $color = imagecolorallocate($this->img,200,200,200);
                imageline($this->img,0,$this->lineSpace * $i,$this->width,$this->lineSpace * $i,$color);
            }
            for ($i = 0;$i<$this->asteriskNum;$i++){
                $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
                imagestring($this->img,6,mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
            }
        }
        //输出图片到浏览器
        private function outPut(){
         
            header('Content-type:image/png');
            imagepng($this->img);
            imagedestroy($this->img);
        }
        //外部调用接口
        public function make(){
         
            $this->createBg();
            $this->createCode();
            $this->createLine();
            $this->createFont();
            $this->outPut();
            return $this->code;
        }
    }
    ?>

[http_download.csdn.net_download_qq_36316736_10129125]: http://download.csdn.net/download/qq_36316736/10129125