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                        /手把手教你实现电商网站后台开发

为什么乱码呢？这是我image.func.php写的文件，求破啊老师，GD库是也开了的。

<?php
require_once "string.func.php";
session_start ();
$width = 80;
$height = 28;
$type = 1;
$length = 5;
$image = imagecreatetruecolor ( $width, $height );
$white = imagecolorallocate ( $image, 255, 255, 255 );
$black = imagecolorallocate ( $image, 0, 0, 0 );
imagefilledrectangle ( $image, 1, 1, $width - 2, $height - 2, $white );
$a = buildRandomString( $type, $length );
$_SESSION ['sess_name'] = $a;
$fontfiles = array (
       "SIMSUN.TTC",
       "STCAIYUN.TTF",
       "STHUPO.TTF"
);
for($i = 0; $i < $length; $i ++) {
   $size = mt_rand ( 14, 18 );
   $angle = mt_rand ( - 15, 20 );
   $x = 5 + $i * $size;
   $y = mt_rand ( 20, 26 );
   $color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );
   $fontfile = "../fonts/" . $fontfiles [mt_rand ( 0, count ( $fontfiles ) - 1 )];
   $text = substr ( $a, $i, 1 );
   imagettftext ( $image, $size, $angle, $x, $y, $color, $fontfile, $text );
}
header ( "content-type:image/gif" );
imagegif ( $image );
imagedestroy ( $image );
?>