php字符串过滤与替换小结

--囧，这有意思么？ static public function nl2br($string){ return nl2br($string); } //将
转化为n static public function br2nl($string){ $array = array('
','
'); return str_replace($array,"n",$string);//字符串替换 } //多个空格只保留一个 static public function merge_spaces($string){ return preg_replace("/s(?=s)/","1",$string);//(?=pattern)举例：abc(?=kk)能匹配abckk，但不能匹配abcdd } //多个
只保留一个 static public function merge_brs($string){ return preg_replace("/((
)+)/i","
",$string);//---"/"为什么也转义了 } //过滤字符串中的html标签 static public function strip_tags($string){ return strip_tags($string); } //将字符串转换为小写--/--大写 static public function strtolower($string){ return strtolower($string); } static public function strtoupper($string){ return strtoupper($string); } //过滤字符串开头与结尾的特定字符 static public function trim($string,$char_list='\s'){ $find = array('/[^-]]/S','/{4}/S','///'); $replace = array('\','','/'); $char = preg_replace($fine,$replace,$char_list); $pattern = '^['.$chars.']*|['.$chars.']'; return preg_replace("/$pattern/sSD",'',$string); } //过滤字符串中/is"; return preg_replace($reg,$string); } //过滤字符串中html危险代码 static public function strip_html_tags($string){ $reg = "/(/?)/(script|iframe|style|html|body|title|meta|?|%)([^>]*?>)/is"; return preg_replace($reg,$string); } } ?>