php怎麼解決驗證碼無法顯示的問題

//Captcha.class.php文件名 codelen = $codelen; $this->width = $width; $this->height = $height; $this->fontsize = $fontsize; $this->fontfile = ".\\Public\\Home\\Fonts\\msyh.ttc"; $this->code = $this->createCode(); $this->img = $this->createImg(); $this->createBg(); //给画布添加背景色 $this->createText(); //写入字符串 $this->line(); //增加干扰线 $this->outPut(); //输出图像 } //私有的生成验证码随机字符串 private function createCode() { //产生随机的字符串数组 $arr_str = array_merge(range('a', 'z'),range('A', 'Z'),range(0,9)); //打乱数组 shuffle($arr_str); shuffle($arr_str); //从数组中随机指定个数下标 $arr_index = array_rand($arr_str,$this->codelen); //循环下标数组,构建随机字符串 $str =""; foreach ($arr_index as $i) { $str .=$arr_str[$i]; } //将验证码字符串存入sess $_SESSION['captcha'] = $str; return $str; } //私有的创建一个空画布 private function createImg() { return imagecreatetruecolor($this->width, $this->height); } //私有的分配画布背景色 private function createBg() { $bgcolor = imagecolorallocate($this->img, mt_rand(0,255), mt_rand(0,200), mt_rand(100,255)); //绘制带背景的矩形 imagefilledrectangle($this->img, 0, 0,$this->width,$this->height, $bgcolor); } //私有的写入验证码字符串 private function createText() { //给文本分配颜色 $color = imagecolorallocate($this->img, mt_rand(100,255), mt_rand(0,200), mt_rand(100,200)); //写入字符串 imagettftext($this->img, $this->fontsize, -12, 10, 20, $color, $this->fontfile, $this->code); //imagestring($this->img, $this->fontsize, 8, 8, $this->code, $color); } //私有的输出图像 private function line() { //增加干扰线 for($n=1;$n<$this->codelen;$n++){ $linecolor = imagecolorallocate($this->img, mt_rand(0,200), mt_rand(0,200), mt_rand(0,200)); imageline($this->img,mt_rand(0,80), mt_rand(0,30), mt_rand(0,100), mt_rand(0,30), $linecolor); } } //公共的输出图像 private function outPut() { //声明输出的内容的类型 header("content-type:image/png"); //输出图像 imagepng($this->img); //销毁图像资源 imagedestroy($this->img); } }

        

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