复制代码 代码如下:
<?php
class cls_string_filter{
//将\n转化为<br/>--囧，这有意思么？
static public function nl2br($string){
return nl2br($string);
}
//将<br/>转化为\n
static public function br2nl($string){
$array = array('<br>','<br/>');
return str_replace($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",$string);//(?=pattern)举例：abc(?=kk)能匹配abckk，但不能匹配abcdd
}
//多个<br/>只保留一个
static public function merge_brs($string){
return preg_replace("/((<br\/?>)+)/i","<br>",$string);//---"https://www.jb51.net/"为什么也转义了
}
//过滤字符串中的html标签
static public function strip_tags($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);
}
}
?>