PHP cookie name cannot use the dot number

Source: Internet
Author: User

This title is not very strict, it should be said that you can use the dot number of the cookie name, but will be converted, you name a cookie:

$_cookie['my.name '] = 1;

In fact, you cannot find this value in a cookie by ' my.name ', Only ' my_name ':

Echo $_cookie['my_name '];

PHP has automatically converted you, and the period turns to underline.

Why does PHP want to do this? This is because $_get/$_post/$_server/$_cookie ... The values of these global functions, in many previous versions, can be accessed directly locally by the Register_globals parameter, for example, when register_globals = On is on, access to the $my_name directly takes a value of 1. If it is $my.name, then it does not conform to the PHP variable naming principle, which is not just a period (.) problem.

As a result, $_cookie's name already conforms to the PHP naming standard.

Also, turning on register_globals is a bad decision because it might overwrite the original values in the script, such as:

// Other code if ($a)     $uc _is_login true ; //  ...

The user simply sends a url?a=1 HTTP request to be logged on by default. This is a very dangerous practice and it should be shut down. In fact, PHP6 has removed this option.

PHP cookie name cannot use the dot number

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