Thank you for your interest in Kali but this is not a bug report. It looks like that you need help and guidance to perform some task. We have community support forums on https://forums.kali.org/ or on IRC with the #kali-linux channel on irc.oftc.net), please post your questions there.

If you want to install php and php-mysql you need to first update apt cache: sudo apt update
and then install the main packages: sudo apt install php php-mysql
Don't install them with the versioned names (example php7.0) as you are using an old package that is no longer in the repositories. The package php and php-mysql will already install the latest versions (currently php8.1).

You can use apt search ... to find available packages

Dear Mr/Mrs
apt-get install php and php-mysql packages have the latest version installed (currently php8.1). But it doesn't suit my needs. So I installed the old php7.0.0-mysql extension tool.

Thanks!

php7 is no longer supported in the kali repos, so this is not a bug

Dear Mr/Mrs
But I successfully installed PHP7.0.0 version, please see the screenshot below. Can you tell me why PHP7.0.0-mysql cannot be installed?

Thanks!

php -v.jpg (19,267 bytes)   

php -v.jpg (19,267 bytes)   

I don't know how you installed php7.0, it was removed from the repositories in 2018
Why not use php8 instead?

image.png (227,446 bytes)   

image.png (227,446 bytes)   

Dear Mr/Mrs

Feel sorry. It does not support php8.0, is there any version 5.5--7.7 of PHP

Thank you!

Sorry but we don't support php 7, even if you try to install it manually it's going to fail.
PHP8 is compatible with php7 so no idea why it says it needs php 7