Description:
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On accessing non-existing properties on an object PHP under some circumstances produces an instance of stdObj on the fly.

In most cases a warning is produced: "Creating default object from empty value"

The warning is missing, if array-syntax is used:

class test {}
$test = new test();
$test->foo->bar['nope'] = 42;

Test script:
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https://3v4l.org/aakSR