[Nginx] Nginx配置编写时支持逻辑运算与大小写字母转换的方法

if ($arg_unitid = 42012 && $uri ~/thumb/){
 echo "www.zzvips.com";
}

set $flag 0;
if ($uri ~ ^/thumb/[0-9]+_160.jpg$){
 set $flag "${flag}1";
}
if ($arg_unitid = 42012){
 set $flag "${flag}1";
}
if ($flag = "011"){
 echo "www.zzvips.com";
}

--add-module=path/to/circle_gif/directory

location /ttlsa_upper_lower {
upper $var1 "Hello,zzvips.com";
lower $var2 "HELLO,zzvips.com";
echo $var1;
echo $var2;
}

# curl http://test.zzvips.com/ttlsa_upper_lower/

HELLO,zzvips.com
hello,zzvips.com