分享一个php过滤字符串函数，具体代码如下：
function striphtml($string){
$pattern=array (''si, ''si, ''si, '([\r\n])[\s]+', '&(quot|#34);'i, '&(amp|#38);'i, '&(lt|#60);'i, '&(gt|#62);'i, '&(nbsp|#160);'i, '&(iexcl|#161);'i, '&(cent|#162);'i, '&(pound|#163);'i, '&(copy|#169);'i, '&#(\d+);'e);
$replace=array ('', '', \\1, '', &, , ' ', chr(161), chr(162), chr(163), chr(169), chr(\\1));
return preg_replace ($pattern, $replace, $str);
}