Remove Bom

remove-bom.php

<?php
// root directory in which to start searching
$HOME=$_SERVER["DOCUMENT_ROOT"];
// use alternatively:
// $HOME=dirname(__FILE__);
// $HOME=dirname(__FILE__);

header("Content-Type: text/plain");
echo "BOM removed from files:\n";
RecursiveFolder($HOME);

// Recursive finder
function RecursiveFolder($sHOME){
	$folder=dir($sHOME);
	$foundfolders=array();
	while($file=$folder->read()){
		if($file=="."||$file=="..")
			continue;
		if(is_dir($sHOME.DIRECTORY_SEPARATOR.$file)){
			$foundfolders[]=$sHOME.DIRECTORY_SEPARATOR.$file;
		}else if(substr(mime_content_type($file),0,4)=="text"){
			$t=file_get_contents($sHOME.DIRECTORY_SEPARATOR.$file);
			if(SearchBOM($content)){
				echo $sHOME.DIRECTORY_SEPARATOR.$file."\n";
				// Remove first three chars from the file
				$t=substr($t,3);
				// Write to file
				file_put_contents($sHOME.DIRECTORY_SEPARATOR.$file,$t);
			}
		}
	}
	$folder->close();
	if(count($foundfolders)>0){
		foreach($foundfolders as $folder){
			RecursiveFolder($folder);
		}
	}
}

// Searching for BOM in files
function SearchBOM($s){
	return substr($s,0,3)==pack("CCC",0xef,0xbb,0xbf);
}

I tried to minimize the original and make it more reliable (was probably written a few PHP versions back)