php字符串过滤与替换小结

本文实例总结了php字符串过滤与替换的方法。分享给大家供大家参考。具体实现方法如下：复制代码 代码如下:<?phpclass cls_string_filter{ //将转化为<br/>--囧，这有意思么？ static public function nl2br($string){  return nl2br($string); } //将<br/>转化为 static public function br2nl($string){  $array = array("<br>","<br/>");  return str_replace($array,"",$string);//字符串替换 } //多个空格只保留一个 static public function merge_spaces($string){  return preg_replace("/s(?=s)/","\1",$string);//(?=pattern)举例：abc(?=kk)能匹配abckk，但不能匹配abcdd } //多个<br/>只保留一个 static public function merge_brs($string){  return preg_replace("/((<br/?>)+)/i","<br>",$string);//---"/"为什么也转义了 } //过滤字符串中的html标签 static public function strip_tags($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("\\\0","\","/");  $char = preg_replace($fine,$replace,$char_list);  $pattern = "^[".$chars."]*|[".$chars."]";  return preg_replace("/$pattern/sSD","",$string); } //过滤字符串中<style>脚本 static public function stric_style($string){  $reg = "/<style[^>]*?>.*?</style>/is";  return preg_replace($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); }}?>

希望本文所述对大家的php程序设计有所帮助。