This is a list of variables that are always implicitly assigned
to the . This is handy for making global
variables or server variables available to all templates
without having to manually assign them. Each element in the
$global_assign should be either a name of the global variable,
or a key/value pair, where the key is the name of the global
array and the value is the array of variables to be assigned
from that global array. $SCRIPT_NAME is globally assigned by
default from $HTTP_SERVER_VARS.
定义一组总是隐式地作用于模板引擎的变量列表。这对于使全局变量或服务器变量可用于所有模板是很方便的，因为无需手工配置它们。在全局配置中的每一元素应当要么是一全局变量的名字，要么是一键/值对（键是全局数组名，值是对应该全局数组的变量数组）。$SCRIPT_NAME变量默认属于$HTTP_SERVER_VARS数组。
Technical Note: Server variables can be accessed through the $smarty variable, such as {$smarty.server.SCRIPT_NAME}. See the section on the $smarty variable.
技巧：服务器变量可以通过$smarty变量获得，如{$smarty.server.SCRIPT_NAME}。参看$smarty变量一节。