Remove whitespace from PHP file

[NotionCommotion]

Had some JS that wasn't working, and turned out I had a whitespace at the end of a PHP file.  To fix it and other bad files, came up with the following.  See any problems with it?  Yea, I know that it surely could be done at the command line, but made me feel safer doing it this way.  Also, maybe should just get rid of the closing PHP tags altogether, but still have the issue with opening tags.  Thanks

<?php
$dir=dirname(dirname(dirname(__FILE__))).'/classes';
echo($dir."\n\n");
$dir = new DirectoryIterator($dir);
foreach ($dir as $fileinfo) {
    if (!$fileinfo->isDot() && $fileinfo->getExtension()=='php') {
        $file=$fileinfo->getPathname();
        $content=file_get_contents($file);
        if(ctype_space(substr($content, 0, 1)) || ctype_space(substr($content, -1))){
            echo("TRIM: $file\n");
            file_put_contents($file, trim($content));
        }
    }
}
?>

[maxxd]

Get rid of the final closing tags on all your php files. Any white space after the closing tag will be output to screen and can cause issues in many different ways.

[NotionCommotion]

Yea, I guess I should just get in the habit of doing so.