显示一个黑色背景中间白框

求大神指导下!~
源码:
<?php
require_once 'string.func.php';
$width = 80;
$height = 28;
//创建画布
$image = imagecreatetruecolor($width,$height);
$white = imagecolorallocate($image,255,255,255);
$black = imagecolorallocate($image,0,0,0);
//用填充矩形填充画布
imagefilledrectangle($image,1,1,$width-2,$height-2,$white);
$type=1;
$length =4;
$chars = buildRandomString($type,$length);
$sess_name = "verify";
$_SESSION[$sess_name] = $chars;
$fontfiles = array("SIMYOU.TTF","STSONG.TTF","msyh.ttc","msyhbd.ttc","msyhl.ttc","simsun.ttc");
for ($i = 0; $i<$length;$i++){
$size = mt_rand(14,18);
$angle = mt_rand(-15,15);
$x = 5+$i*$size;
$y = mt_rand(20,26);
$fontfiles="../fonts".$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,$color,$fontfiles,$text);
}
header("content-type:image/gif");
imagegif($image);
imagedestroy($image);<?php
function buildRandomString($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 ( "字符串长度不够" );
}
$chars = str_shuffle ( $chars );
return substr ( $chars, 0, $length );
}

我把你的代码拷贝过来试了一下,字体那块出错了,改了以后就正常了。你看看是不是字体文件写错了,或者是字体路径?