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驗證碼不顯示求解答

<?php
ob_clean();
require_once?'string.func.php';
//通過GD庫實現驗證碼
//創建畫布
$width=80;
$height=20;
$image=imagecreate($width,?$height);
//設置畫布顏色
$white=imagecolorallocate($image,?255,?255,255);
//設置畫筆顏色
$black=imagecolorallocate($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;
$chars=buildRandomString($type,$length);
$sess_name="verify";

header("Content-Type:image/png");

imagegif($image);
//SESSION，目的就是要與用戶輸入的驗證碼進行比對
$_SESSION['sess_name']=$chars;
$fontfiles=array("MSYH.TTF","MSYHBD.TTF","SIMSUN.TTC","SIMYOU.TTF");

for?($i=0;$i<$length;$i++){
????//寫?TTF文字到圖中。
????$size?=?mt_rand?(?14,?18?);
????$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?);
????imagestring(?$image,?$size,?$angle,?$x,?$y,?$color,?$fontfile,?$text?);
????
}

?>