<?php
header("content-type:image/gif");
//通過GD庫做驗證碼
//創建畫布
session_start();
require?'string.func.php';
$width?=?80;
$height?=?30;
$image?=?imagecreatetruecolor($width,?$height);
$white?=?imagecolorallocate($image,?255,?255,?255);
$black?=?imagecolorallocate($image,?0,?0,?0);
//用填充矩形來填充畫布
imagefilledrectangle($image,?1,?1,?$width-2,?$height-2,?$white);
$type=1;
$length=4;?
$chars=bulitRandomString($type,$length);
$sess_name="verify";
$_SESSION[$sess_name]=$chars;
$fontfile=array("WINGDNG2.TTF");
for($i=0;?$i?<?length;?$i++)
{
	$size?=?mt_rand(14,18);
	$angle=mt_rand(-15,15);
	$x?=?5+?$i?*?$size;
	$y=mt_rand(20,26);
	$fontfile?=?"../fonts/"?.?$fontfiles?[mt_rand?(?0,?count?(?$fontfiles?)?-?1?)];
	$text=substr($chars,?$i,?1);
	$color=imagecolorallocate($image,?mt_rand(50,90),?mt_rand(80,200),?mt_rand(20,160));
	imagettftext($image,?$size,?$angle,?$x,?$y,?$color,?$fontfile,?$text);
}

imagegif($image);
imagedestroy($image);

string函數應該沒問題。