PHP file_get_contents是否增加了空格？

I'm loading a text file to put inside a textarea with file_get_contents() and for some reason, white space is inserted before and after the original text each time I load it. I know the white space isn't inserted during saving, because I checked the saved file from my FTP client and there was no white space.

<textarea name="banner" cols="100" rows="20">
<?php echo file_get_contents('banner.txt'); ?>
</textarea>
<br/>

I'm using similar code for several other files, with the same result. The exact amount of white space is 16 characters long.

It's because of the linebreaks inside the <textarea> tags. Write it in directly inside the tag brackets and it should be fine:

<textarea name="banner" cols="100" rows="20"><?= 
    file_get_contents('banner.txt'); ?></textarea>