php
class cls_
String_filter
{
//将\n转化为
--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('\\\\\\0','\\','\/');
$char = preg_replace($fine,$replace,$char_list);
$pattern = '^['.$chars.']*|['.$chars.']';
return preg_replace("/$pattern/sSD",'',$String);
}
//过滤字符串中
