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<?php class ClassB { private const THE_PRIVATE_CONSTANT = 9; public const THE_PUBLIC_CONSTANTS = 9; } var_dump( (new ReflectionClass(ClassB::class))->getConstants() );
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["THE_PRIVATE_CONSTANT"]=> int(9) ["THE_PUBLIC_CONSTANTS"]=> int(9) }

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