php清除字符串中HTML代码、空格、回车换行符

function DeleteHtml($str) 
{ 
$str = trim($str); 
$str = strip_tags($str,""); 
$str = ereg_replace("\t","",$str); 
$str = ereg_replace("\r\n","",$str); 
$str = ereg_replace("\r","",$str); 
$str = ereg_replace("\n","",$str); 
$str = ereg_replace(" "," ",$str); 
return trim($str); 
}

通过以上代码可以清除HTML代码、空格、回车换行符的函数，根据自己需要可以扩充。