没装APACHE和MYSQL,太晚了,明天再装了,各位DX给看看有没写错,我觉得变量总是有问题的感觉,两个函数的变量如何"共享"?也是用global吗?

<?php
function sql_conn()
{
global $hostname,$sql_user,$sql_pass,$db_name;
$sql_conn=mysql_connect($hostname,$sql_user,$sql_pass);
mysql_select_db($db_name);
}
function login()
{
global $sql_conn;
sql_conn();
$query="select password from user where username='".$username."'";
$result=mysql_query($query);
$answer=mysql_fetch_array($result);
if ($answer='false')
{
echo '你所填写的用户名有错误!';
}
else {
if ($password==$answer["password"])
{
setcookie("username",$username,time()+3600);
mysql_close($sql_conn);
echo '你是合法用户';
}
else
mysql_close($sql_conn);
echo '你不是合法用户';

}
}
?>