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@ 2020-10-16T15:39:38Z

<?php
class SomeClass
{
    protected string|stdClass $a;
}

$unionType = (new \ReflectionClass(SomeClass::class))->getProperty('a')->getType();
var_dump($unionType->isBuiltin());

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive preview

38.48 ms | 402 KiB | 5 Q