php脚本无法发送标头，因为标头已经发送，但是脚本之外的字符

Question

This are my first two lines:

<?php
header('Content-Type: application/x-javascript');

And it gives me the headers already sent in line 1.

It is intended to generate a JavaScript file that loads from an HTML page, when checked the JavaScript file from Firebug i got the following file:

1  <br />
2  <b>Warning</b>: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Group\Apache2\htdocs\totoro\Js\libs.php:1) in <b>C:\Program Files\Apache Group\Apache2\htdocs\totoro\Js\libs.php</b> on line <b>1</b><br />
3  var Totoro = {}, $t = Totoro;

As you can see, it spits a character that looks like garbage characters, but nothing is sended, the first line is a header function call. What might be the problem?

Answer 1

You have most probably saved the file as UTF-8 with BOM (Byte-order mark), resave it as UTF-8 without said thingy.