PHP code to convert text to HTML

//文本转HTML
function Text2Html($txt)
{
$txt = str_replace(”  ”,”　”,$txt);
$txt = str_replace(“<”,”<”,$txt);
$txt = str_replace(“>”,”>”,$txt);
$txt = preg_replace(“/[\r\n]{1,}/isU”,”\r\n”,$txt);
return $txt;
}
?>