How to hide certain environment in latex?

Question

TeX

I create my own environment, but in the document it must be hidden if it is defined using a \defvariable and equals true.
For example:

\usepackage{ifthen}
% ...
\def\showmyenv{true}
% ...
\newenvironment{myenv} {
    \ifthenelse{ \equal{\showmyenv}{true} } {
        % отобразить содержимое окружения
    }{
        % не отображать содержимое окружения
    }
} {}

How to specify that the content between \begin{myenv}and is not displayed \end{myenv}?
The need is that I need to generate several documents, one of which will not contain the specified blocks.
Are there alternative options?

Answer 1

I decided to rewrite the code so as not to use capacious constructions \ifthenelseinside environments. I left the flag variable, cleared the environment from ifthenelse, and after the environment (or at the end of the preamble) I use the environment redefinition after checking the flag variable.

\usepackage{ifthen}
\usepackage{environ}
% ...
\def\showmyenv{true}
% ...
\newenvironment{myenv} {
    % содержимое окружения
}{}
% ...
\ifthenelse{\equal{\showmyenv}{false}}{
    \RenewEnviron{myenv}{}
}{}