Thinkphp 3.2 Opening Cache cache considerations, filtering illegal characters

Open the cached configuration file/application/common/conf/cache.php source code is as follows:

<?phpreturn Array(    //'Configuration Items' = 'Configuration Values'    ' layout_on '=true,    ' html_cache_on '=Strpos($_server[' Http_host '], '. ') !== false, // turning on static caching defaults totrueLocal does not open    ' Html_cache_time '=3600, // global Static cache validity period (seconds)    ' Html_file_suffix '='. shtml ', // set the static cache file suffix    ' Html_cache_rules '=Array(        ' * '=Array(' {: Module}/{:controller}/{:action}/{$_server. REQUEST_URI|MD5} ', 3600, ' TRIMSW '),    ));

Note: the TRIMSW behind is to remove all non-/\w strings, preventing certain system errors from entering special characters such as Chinese.

The source of the function TRIMSW:

/** * @author [email protected] * @descriptionremove spaces and non-\wstring that is used toCacheConfiguration * * @param$str * @paramstring $emptyValue * * @returnmixed|string */functionTRIMSW ($str, $emptyValue= ' _empty_ '){    $str= Preg_replace('/([^\w\/]+)/', '-', $str);    if(Empty($str)) {        $str= $emptyValue;    }    return$str;}

Thinkphp 3.2 Opening Cache cache considerations, filtering illegal characters