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<?php class CLASS_A{} $classA = 'CLASS_A'; $function = new \ReflectionClass($classA); var_dump($function->getName());
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(7) "CLASS_A"

preferences:
173.37 ms | 403 KiB | 198 Q