[5.3] Language switcher php deprecated notices

[brianteeman]

Pull Request for Issue #43293 .

Summary of Changes

Fixes

• Deprecated: strtolower(): Passing null to parameter Test #1 ($string) of type string is deprecated in libraries/src/Extension/ExtensionManagerTrait.php on line 45
• Deprecated: str_replace(): Passing null to parameter Ignore configuration.php #3 ($subject) of type array|string is deprecated in modules/mod_languages/src/Helper/LanguagesHelper.php on line 79

Testing Instructions

Make sure you are using php 8.1 or higher
Create a bilingual site
Create an instance of mod_languages in a position that exists also on an error page
In global configuration, set error reporting to maximum
Navigate to a url that will produce an error

Actual result BEFORE applying this Pull Request

two deprecated messages displayed

Expected result AFTER applying this Pull Request

No errors displayed

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[ghost]

I have tested this item ✅ successfully on a51f43c

Before PR

After PR

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45261.}

[exlemor]

I have tested this item ✅ successfully on a51f43c

I have tested this successfully. Thanks @brianteeman.

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45261.}

[bembelimen]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45261.}

[joomdonation]

The right fix for the issue is #45262 . The change in this PR does not really fix the issue, it is just hiding the issue with our code elsewhere (for example, we should check and only call bootComponent if $component is not null instead, later, we can use string type for the parameter and let PHP throws the error if the passed argument is invalid). I suggest to close this PR.

[HLeithner]

We do not cast null to string (or ?? '') to make php happy, that's simple the wrong way to go, because there is a reason we get NULL. This should not happen and needs to be fixed, as tuan did in #45262

I'm closing this.

[brianteeman]

ok