PHP編碼轉換方法

PHP編碼轉換方法
$url = "http://j-jis.com/";  
$html = file_get_contents($url);  
$html = preg_replace("/rn|n|t/", "", $html); //remove unwanted characters  
$html = iconv("Shift_JIS","UTF-8",$html); //convert encoding  
echo $html;