Detect callables and dynamic calls

[spaze]

This version replaces 4.1.0 in which callables were not detected in constructors. The notes below are the taken from 4.1.0.

This release adds new detections listed below, meaning it's possible that you'll see new error messages.

First class callable syntax (#279), for example:

$func = print_r(...);
$func();

Dynamic calls (#276, #278), for example:

$func('foo');
$object->$method();

Test anonymous class usages (#277), for example:

$foo = new class implements ...
$foo = new class extends ...

Anonymous class usages (when the anonymous class extends DisallowedClass for example) were detected before, however the detection is now tested.

Detect callable parameters (#281, #283, #285), for example:

array_map('function', []);
array_map([$object, 'method'], []);
array_map([Class::class, 'staticMethod']);

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This discussion was created from the release Detect callables and dynamic calls.