php验证码类带字体

<?php
class Captcha {
    private $width = 160;
    private $height = 50;
    private $codeNum = 4;
    private $code;
    private $img;

    public function __construct() {
        $this->code = $this->createCode();
        $this->img = imagecreatetruecolor($this->width, $this->height);
        $this->setBg();
        $this->setCode();
        $this->setDisturbColor();
        $this->output();
    }

    private function createCode() {
        $arr = array_merge(range(0, 9), range('a', 'z'), range('A', 'Z'));
        shuffle($arr);
        return substr(implode('', $arr), 0, $this->codeNum);
    }

    private function setBg() {
        $bgColor = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
        imagefill($this->img, 0, 0, $bgColor);
    }

    private function setCode() {
        $fontFile = 'path/to/font.ttf'; // 替换为你的字体文件路径
        $codeColor = imagecolorallocate($this->img, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
        $x = 20;
        $y = mt_rand(15, 25);
        for ($i = 0; $i < $this->codeNum; $i++) {
            imagettftext($this->img, mt_rand(20, 25), mt_rand(-30, 30), $x, $y, $codeColor, $fontFile, $this->code[$i]);
            $x += 30;
        }
    }

    private function setDisturbColor() {
        for ($i = 0; $i < 300; $i++) {
            $color = imagecolorallocate($this->img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
            imagesetpixel($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
        }
    }

    private function output() {
        header('Content-type: image/png');
        imagepng($this->img);
        imagedestroy($this->img);
    }

    public function getCode() {
        return $this->code;
    }
}

$captcha = new Captcha();
?>