语法: str = ngx.encode_args(table)
环境: set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.*
根据 URI 编码规则，将 Lua 表编码成一个查询参数字符串。
例如，
ngx.encode_args({foo = 3, ["b r"] = "hello world"})生成
foo=3&b%20r=hello%20world
Lua 表的 key 必须是 Lua 字符串。
支持多值参数。可以使用 Lua 表存储参数值，例如：
ngx.encode_args({baz = {32, "hello"}})输出
baz=32&baz=hello
如果 value 表是空的，效果等同于 nil 值。
支持布尔值参数，例如，
ngx.encode_args({a = true, b = 1})输出
a&b=1
如果参数值是 false，效果等同于 nil 值。
这个方法最早出现在版本 v0.3.1rc27 中。
English Source
syntax: str = ngx.encode_args(table)
context: set_by_lua*, rewrite_by_lua*, access_by_lua*, content_by_lua*, header_filter_by_lua*, body_filter_by_lua*, log_by_lua*, ngx.timer.*
Encode the Lua table to a query args string according to the URI encoded rules.
For example,
ngx.encode_args({foo = 3, ["b r"] = "hello world"})yields
foo=3&b%20r=hello%20world
The table keys must be Lua strings.
Multi-value query args are also supported. Just use a Lua table for the argument's value, for example:
ngx.encode_args({baz = {32, "hello"}})gives
baz=32&baz=hello
If the value table is empty and the effect is equivalent to the nil value.
Boolean argument values are also supported, for instance,
ngx.encode_args({a = true, b = 1})yields
a&b=1
If the argument value is false, then the effect is equivalent to the nil value.
This method was first introduced in the v0.3.1rc27 release.