An issue you need to pay attention to when using $_REQUEST in PHP_PHP Tutorial

Question
Speaking of $_REQUEST, everyone knows that it is a collection of $_GET and $_POST. But if you are interested, check the documentation and you will see:

$_REQUEST

An associative array that by default contains the contents of $_GET, $_POST and $_COOKIE.

It is said here that $_REQUEST defaults to a collection of $_GET, $_POST, and $_COOKIE. As a result, I used my local php to check and found that there were only $_GET, $_POST, and no $_COOKIE! ! Could it be that the documentation is wrong?

Answer
In fact, there is an explanation in the changelog:

Version 5.3 and above, there is a request_order attribute in php.ini to set $_REQUEST. After checking php.ini, request_order is set to GP (Get and Post).

request_order’s official website description:

request_order string

This directive describes the order in which PHP registers GET, POST and Cookie variables into the _REQUEST array. Registration is done from left to right, newer values ​​override older values.

If this directive is not set, variables_order is used for $_REQUEST contents.

Note that the default distribution php.ini files does not contain the 'C' for cookies, due to security concerns.

It turns out that G, P, and C represent Get, Post, and Cookie respectively. In version 5.3 and above, request_order is set to GP by default and does not include C, that is, $_REQUEST only contains $_GET and $_POST by default!! (So The official website documentation is somewhat misleading).

Also, the order of G, P, C is the covering order of the set array.

As a reminder, if you are using fpm-php for experiments, you need to restart php-fpm after changing php.ini

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