Get the dynamic database driver for the configuration.

[twister65]

Pull Request for deprecated database driver:
The PHP ext/mysql extension is removed in PHP 7, cannot use the mysql driver.
https://github.com/twister65/joomla-cms/blob/0346c2fc3668984b3b85ecb4a4941c6752c13f9c/libraries/joomla/database/driver.php#L257

See PR #25729

Summary of Changes

Get the actual database driver loaded at run time and fill in the dbtype parameter in the configuration form. You must save the configuration to update the file.

Testing Instructions

Expected result

Actual result

Documentation Changes Required

[richard67]

I have tested this item ✅ successfully on 0346c2f

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[viocassel]

I have tested this item ✅ successfully on 0346c2f

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[Quy]

RTC

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[HLeithner]

Is there a reason not to merge it into 3.9?

[alikon]

for php < 7 ext/mysql is not deprecated iirc

[mbabker]

for php < 7 ext/mysql is not deprecated iirc

The extension was deprecated as of PHP 5.5 and removed from PHP 7.

[richard67]

Good question why it is not done in staging.

[twister65]

Yes, this must also be done in staging:

joomla-cms/libraries/joomla/database/driver.php

Line 257 in 6691b89

if ($options['driver'] === 'mysql' && PHP_MAJOR_VERSION >= 7)

I'm doing a new PR for that.

[richard67]

As there is a PR for staging, too, which does the same thing, this PR should be closed, otherwise they guys will have merge conflicts (which is not a big problem but a bit inconvenient).

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