create_code.php<?phpsession_start();//生成验证码图片header("Content-type: image/png");// 全数字$str = "1,2,3,4,5,6,7,8,9,a,b,c,d,f,g";      //要显示的字符，可自己进行增删$list = explode(",", $str);$cmax = count($list) - 1;$verifyCode = ‘‘;for ( $i=0; $i < 5; $i++ ){      $randnum = mt_rand(0, $cmax);      $verifyCode .= $list[$randnum];           //取出字符，组合成为我们要的验证码字符}$_SESSION[‘code‘] = $verifyCode;        //将字符放入SESSION中 $im = imagecreate(58,28);    //生成图片$black = imagecolorallocate($im, 0,0,0);     //此条及以下三条为设置的颜色$white = imagecolorallocate($im, 255,255,255);$gray = imagecolorallocate($im, 200,200,200);$red = imagecolorallocate($im, 255, 0, 0);imagefill($im,0,0,$white);     //给图片填充颜色 //将验证码绘入图片imagestring($im, 5, 10, 8, $verifyCode, $black);    //将验证码写入到图片中 for($i=0;$i<50;$i++)  //加入干扰象素{     imagesetpixel($im, rand()p , rand()0 , $black);    //加入点状干扰素     imagesetpixel($im, rand()p , rand()0 , $red);     imagesetpixel($im, rand()p , rand()0 , $gray);     //imagearc($im, rand()p, rand()p, 20, 20, 75, 170, $black);    //加入弧线状干扰素     //imageline($im, rand()p, rand()p, rand()p, rand()p, $red);    //加入线条状干扰素}imagepng($im);imagedestroy($im);?>