php导入到excel 引入文件时就出现乱码

<?
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");;
header("Content-Disposition: attachment;filename=test.xls ");
header("Content-Transfer-Encoding: binary ");require_once(INCPATH.'include/initLosadCom.php');
$name1=iconv("UTF-8","gb2312//IGNORE","编号");
$name2=iconv("UTF-8","gb2312//IGNORE","地区");
$name3=iconv("UTF-8","gb2312//IGNORE","地名");xlsBOF();
xlsWriteLabel(0,0,$name1);
xlsWriteLabel(0,1,$name2);
xlsWriteLabel(0,2,$name3); for($i=0;$i<5;$i++){

xlsWriteLabel(1,$i,"In the excel");

}
xlsEOF();function xlsBOF() {
    echo pack("ssssss", 0x809, 0x8, 0x0, 0x10, 0x0, 0x0);
    return;
}
function xlsEOF() {
    echo pack("ss", 0x0A, 0x00);
    return;
}
function xlsWriteNumber($Row, $Col, $Value) {
    echo pack("sssss", 0x203, 14, $Row, $Col, 0x0);
    echo pack("d", $Value);
    return;
}
function xlsWriteLabel($Row, $Col, $Value ) {
    $L = strlen($Value);
    echo pack("ssssss", 0x204, 8 + $L, $Row, $Col, 0x0, $L);
    echo $Value;
    return;
}
?>当引入 required_once();时 就出现了 乱码