Where is the PHP pdo_mysql extension downloaded? (Pecl said the package is no longer maintained and replaced.)

The pecl above shows that it has been deprecated and goes to the following URL, but this URL opens with an error (not found on GitHub)

This are not maintained anymore and have been superseded. Package have moved to channel http://svn.php.net/viewvc/php ... package ext/pdo_mysql.
The following description says do not use this, then where to go under the pdo_mysql extension? (I am an Ubuntu apt installed php7)
Do not use this, as PDO have been moved into core (the PHP source) so this pecl extension is dead.
This, extension provided a MySQL driver for PDO.

1. Where to download the latest pdo_mysql extensions (resolved)

2. Am I installed on my Computer php-cli and php-fpm are they two public an extension? (for example, I want to install Pdo_mysql extensions do I need to install them once?) How do I specify the version of PHP to install at compile time? ）

3. Can I copy a file directly from another computer pdo_mysql.so ? Or do I have to compile the installation on the current computer to be valid?

Now that it's installed, but I installed it through APT, would you like to ask if the PHP installation does not compile the installation extension? 2, 32 questions, who's the answer?

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