那里寫錯了 ? ?大神。。。。images.func.php ? ? 看不見 隨機數字 ? 只有一塊白色 畫布

<?php
require_once?'string.func.php';
//創建畫布
//通過GD庫
$width?=?80;
$height?=28;
$image?=?imagecreatetruecolor($width,?$height);

$white?=?imagecolorallocate($image,?255,?255,?255);
$black?=?imagecolorallocate($image,?0,?0,?0);
//用填充矩形?填充畫布
imagefilledrectangle($image,?1,1,$width?-?2,$height?-?2,?$white);
$type=1;
$length=4;
$chars?=?buildRandomString?(?$type,?$length?);
//比對檢查碼
$sess_name="verify";
$_SESSION[$sess_name]=$chars;
$fontfiles=array("FZLTCXHJW.TTF","SIMFANG.TTF","SIMHEI.TTF,SIMKAI.TTF,SIMSUN.TTC");
$fontfiles?=?array?("SIMHEL.TTF"?);
for?($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)];
	$color=imagecolorallocate($image,?mt_rand(50,90),mt_rand(80,200),mt_rand(90,180));
	$text=?substr($chars,$i,1);
	imagettftext($image,?$size,?$angle,?$x,?$y,?$color,?$fontfile,?$text);
}
header("content-type:image/gif");
imagegif($image);
imagedestroy($image);

string.func.php

那里寫錯了 ? ?大神。。。。string.func.php

<?php?

function?buildRandomString($type=1,$length=4){
	if?($type?==?1)?{
		$chars?=?join?(?"",?range?(?0,?9?)?);
	}?elseif?($type?==?2)?{
		$chars?=?join?(?"",?array_merge?(?range?(?"a",?"z"?),?range?(?"A",?"Z"?)?)?);
	}?elseif?($type?==?3)?{
		$chars?=?join?(?"",?array_merge?(?range?(?"a",?"z"?),?range?(?"A",?"Z"?),?range?(?0,?9?)?)?);
	}
	if?($length?>?strlen?(?$chars?))?{
		exit?(?"字符串長度不夠"?);
	}
	$chars?=?str_shuffle?(?$chars?);
	return?substr?(?$chars,?0,?$length?);
}
?>