[4.0] opcache invalidate

[alikon]

Pull Request for Issue #24678 .

Summary of Changes

porting of #21949 on 4.x

Testing Instructions

see #24678

Expected result

setting saved in global configuration setting

Actual result

not saved at 1st save

[wilsonge]

If we're doing this we should probably call the full suite of functions

joomla-cms/administrator/components/com_joomlaupdate/restore.php

Lines 8317 to 8333 in 34faac6

	// opcode cache busting before including the filename
	if (function_exists('opcache_invalidate'))
	{
	opcache_invalidate($filename);
	}
	if (function_exists('apc_compile_file'))
	{
	apc_compile_file($filename);
	}
	if (function_exists('wincache_refresh_if_changed'))
	{
	wincache_refresh_if_changed(array($filename));
	}
	if (function_exists('xcache_asm'))
	{
	xcache_asm($filename);
	}

[alikon]

i've only opcache available to test 🤕 ....

[ghazal]

Something should be done one way or the other.
Anyhow this works.

[twister65]

OPcache improves PHP performance by storing precompiled script bytecode in shared memory, thereby removing the need for PHP to load and parse scripts on each request.
This extension is bundled with PHP 5.5.0 and later.

OPcache is the most usual. It is used on cloudaccess.net servers. I think the others are optional, as I did in these commits:
76b4634
eb5c9b5
Some of the other functions are not longer maintained and are deprecated.
See joomla-framework/filesystem#19 (comment)

[twister65]

I have tested this item ✅ successfully on ede7190

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/24709.}

[wilsonge]

This has effectively been merged with the merging in of 3.9.1 earlier today. I still think we should add in all the cache functions that we support officially (obviously no issues dropping the ones no longer required in php 7)