In phpcookie, the dot (period) is automatically converted to an underscore.

This article mainly introduces the problem of automatically converting the periods (periods) into underscores (_) in PHP cookies. For more information, see

This article mainly introduces the problem of automatically converting the dot (full period) into an underscore in php cookies. For more information, see

Php Cookies cannot use periods (periods). In fact, they are not very strict. we should say that we can use the cookie name of periods, but it will be converted. You name a cookie:

$ _ COOKIE ['my. name'] = 1;

In fact, you cannot find this value in the cookie through 'My. name'. It can only be 'my _ name ':

Echo $ _ COOKIE ['my _ name'];

Php has automatically converted to underline.

Why does php do this? This is because $ _ GET/$ _ POST/$ _ SERVER/$ _ COOKIE... In many previous versions, the values of these global functions can be directly accessed locally using the register_globals parameter. For example, after register_globals = on is enabled, the value of $ my_name for access is 1. If it is $ my. name, it does not comply with the naming principles of php variables. This is not just a problem of periods.

Therefore, the $ _ COOKIE name complies with the php Naming Standard.

In addition, enabling register_globals is a bad decision, because it may overwrite the original value in the script, for example:

// Other code
If ($)
$ Uc_is_login = true;
//...

The user only needs to send a url? A = 1 http request can be logged in by default. This is a very dangerous practice and should be disabled. In fact, php6 has removed this option.