Questions about php variables

[Help] php Variable variables are based on php Super global variables $ _ REQUEST $ _ type = '_ request'; var_dump ($ _ type); Notice: undefinedvariable: _ REQUES. if $ _ type is _ GET or _ POST or another variable, no [help] Questions about php Variable variables
Super global variable $ _ REQUEST for php

$ _ Type = '_ request ';
Var_dump ($ _ type );

Notice: Undefined variable: _ REQUES

If $ _ type is _ GET or _ POST or another variable, there is no problem. what is wrong with me?

------ Solution --------------------
This should be a BUG.
My php version is 5.3.6, which is the same as yours.
However, if $ _ type = '_ request'; appears
That is
$ _ REQUEST;
$ _ Type = '_ request ';
It is not empty.

However, it is still incorrect. $ _ REQUEST should contain cookie content.
But at least $ _ REQUEST in php 5.3.6 does not


------ Solution --------------------
My account is 5.2.6. No problem.
------ Solution --------------------
Here is the answer
Http://stackoverflow.com/questions/2078102/request-not-created-when-using-variable-variables
Disable auto_globals_jit in php. ini and no notice will be prompted.
Http://www.php.net/manual/en/ini.core.php#ini.auto-globals-jit
------ Solution --------------------
Try to enable this

Register_long_arrays = On