<?php
function rmBOM($string) { 
	if(substr($string, 0,3) == pack('CCC',0xef,0xbb,0xbf)) { 
		$string=substr($string, 3); 
	}
	return $string;
}
function rmBOMFile($fileName) {
	$fp = fopen($fileName, 'r');
	$_content = fread($fp, filesize($fileName));
	@fclose($fp);
	$_content = rmBOM($_content);
	$fp = fopen($fileName, 'w');
	fwrite($fp, $_content);
	@fclose($fp);
}
rmBOMFile('파일명'); // utf-8 파일에서 BOM 을 제거합니다.
?>