DevelopmentCodeFragment doesn't work as expected

[SanderSander]

• PHPMD version: 2.12.0
• PHP Version: 8.1
• Installation type: (composer)

Function calls like var_dump are not detected in by the the Rule/Class DevelopmentCodeFragment.
It sees the calls as in my case string(21) "composerlink\var_dump" where composerlink is the root namespace.

This has to do with the namespace, but in the namespace composerlink a method var_dump doesn't exist at all.

PHP Just uses the internal var_dump method, and you should expect phpmd to fail on this, except when you define a method var_dump in that namespace. (When ignore-namespace is true it should always fail).

Current Behavior

No violations detected

Expected Behavior

 86 | VIOLATION | The method LinkManager::linkPackage() calls the typical debug function var_dump() which is mostly only used during development.

Steps To Reproduce:

Add var_dump somewhere in your code, and run ./vendor/bin/phpmd ./src ansi design

Additional info

With the following configuration it works like excepted, but disables the ability to define one of these methods in any namespace.

    <rule ref="rulesets/design.xml">
        <exclude name="DevelopmentCodeFragment" />
    </rule>
    <rule ref="rulesets/design.xml/DevelopmentCodeFragment">
        <properties>
            <property name="ignore-namespaces" value="true" />
        </properties>
    </rule>

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• If possible I added relevant code examples.
• This issue is about 1 bug and nothing more.
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[SanderSander]

I tried to fix it but I''m not aware of a way to detect if the method truly exists