PHP简单会话不能使用.htaccess


php simple session not working with .htaccess

// Read Get cerruncy from URL request
if(in_array("crncy",$get_page_all)) {
$crnc_set = explode("/crncy/",$open_page);
$crnc = $crnc_set[1];
$get_crnc = (string) $crnc;
$_SESSION['xxxc'] = $get_crnc;
}
if($_SESSION['xxxc']){
echo $_SESSION['xxxc'];
}
else {echo 'Noooooooooo';}

我的问题:在下一次刷新$_SESSION['xxxc']值得到改变。

使用session_start();