<?php
session_start();
class Code{

    //资源private$img;
    //画布宽度private$width=100;
    //画布高度private$height=30;
    //背景颜色private$bgColor=‘#ffffff‘;
    //验证码private$code;
    //验证码的随机种子private$codeStr=‘23456789abcdefghjkmnpqrstuvwsyz‘;
    //验证码长度private$codeLen=4;
    //验证码字体private$font;
    //验证码字体大小private$fontSize=16;
    //验证码字体颜色private$fontColor=‘‘;

    publicfunction __construct() {
    }

    //创建验证码publicfunction make()
    {
        if(empty($this->font))
        {
            $this->font = base_path().‘\public\out\consola.ttf‘;
        }
        $this->create();//生成验证码header("Content-type:image/png");
        imagepng($this->img);
        imagedestroy($this->img);
        exit;
    }

    //设置字体文件publicfunction font($font)
    {
        $this->font= $font;
        return$this;
    }

    //设置文字大小publicfunction fontSize($fontSize)
    {
        $this->fontSize=$fontSize;
        return$this;
    }

    //设置字体颜色publicfunction fontColor($fontColor)
    {
        $this->fontColor = $fontColor;
        return$this;
    }

    //验证码数量publicfunction num($num)
    {
        $this->codeLen=$num;
        return$this;
    }

    //设置宽度publicfunction width($width)
    {
        $this->width = $width;
        return$this;
    }

    //设置高度publicfunction height($height)
    {
        $this->height = $height;
        return$this;
    }

    //设置背景颜色publicfunction background($color)
    {
        $this->bgColor = $color;
        return$this;
    }

    //返回验证码publicfunction get() {
        return$_SESSION[‘code‘];
    }

    //生成验证码privatefunction createCode() {
        $code = ‘‘;
        for ($i = 0; $i < $this->codeLen; $i++) {
            $code .= $this->codeStr [mt_rand(0, strlen($this->codeStr) - 1)];
        }
        $this->code = strtoupper($code);
        $_SESSION[‘code‘] = $this->code;
    }

    //建画布privatefunction create() {
        if (!$this->checkGD())
            returnfalse;
        $w = $this->width;
        $h = $this->height;
        $bgColor = $this->bgColor;
        $img = imagecreatetruecolor($w, $h);
        $bgColor = imagecolorallocate($img, hexdec(substr($bgColor, 1, 2)), hexdec(substr($bgColor, 3, 2)), hexdec(substr($bgColor, 5, 2)));
        imagefill($img, 0, 0, $bgColor);
        $this->img = $img;
        $this->createLine();
        $this->createFont();
        $this->createPix();
        $this->createRec();
    }

    //画线privatefunction createLine(){
        $w = $this->width;
        $h = $this->height;
        $line_color = "#dcdcdc";
        $color = imagecolorallocate($this->img, hexdec(substr($line_color, 1, 2)), hexdec(substr($line_color, 3, 2)), hexdec(substr($line_color, 5, 2)));
        $l = $h/5;
        for($i=1;$i<$l;$i++){
            $step =$i*5;
            imageline($this->img, 0, $step, $w,$step, $color);
        }
        $l= $w/10;
        for($i=1;$i<$l;$i++){
            $step =$i*10;
            imageline($this->img, $step, 0, $step,$h, $color);
        }
    }

    //画矩形边框privatefunction createRec() {
        //imagerectangle($this->img, 0, 0, $this->width - 1, $this->height - 1, $this->fontColor);    }

    //写入验证码文字privatefunction createFont() {
        $this->createCode();
        $color = $this->fontColor;
        if (!empty($color)) {
            $fontColor = imagecolorallocate($this->img, hexdec(substr($color, 1, 2)), hexdec(substr($color, 3, 2)), hexdec(substr($color, 5, 2)));
        }
        $x = ($this->width - 10) / $this->codeLen;
        for ($i = 0; $i < $this->codeLen; $i++) {
            if (empty($color)) {
                $fontColor = imagecolorallocate($this->img, mt_rand(50, 155), mt_rand(50, 155), mt_rand(50, 155));
            }
            imagettftext($this->img, $this->fontSize, mt_rand(- 30, 30), $x * $i + mt_rand(6, 10), mt_rand($this->height / 1.3, $this->height - 5), $fontColor, $this->font, $this->code [$i]);
        }
        $this->fontColor = $fontColor;
    }

    //画线privatefunction createPix() {
        $pix_color = $this->fontColor;
        for ($i = 0; $i < 50; $i++) {
            imagesetpixel($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
        }

        for ($i = 0; $i < 2; $i++) {
            imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $pix_color);
        }
        //画圆弧for ($i = 0; $i < 1; $i++) {
            // 设置画线宽度
            imagearc($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height)
                , mt_rand(0, 160), mt_rand(0, 200), $pix_color);
        }
        imagesetthickness($this->img, 1);
    }

    //验证GD库privatefunction checkGD() {
        returnextension_loaded(‘gd‘) && function_exists("imagepng");
    }

}