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<?php class x { const CONSTANT = 'const'; public static function func() { return __METHOD__; } } $class = 'x'; $constant = 'CONSTANT'; $function = 'func'; $classConstant = $class . '::' . $constant; $classFunc1 = $class . '::' . $function; $classFunc2 = array($class, $function); var_dump(x::CONSTANT); var_dump(x::func()); var_dump($class::CONSTANT); var_dump($class::func()); var_dump($class::$function()); var_dump($classConstant); var_dump($classFunc1()); var_dump($classFunc2());
Output for git.master, git.master_jit, rfc.property-hooks
string(5) "const" string(7) "x::func" string(5) "const" string(7) "x::func" string(7) "x::func" string(11) "x::CONSTANT" string(7) "x::func" string(7) "x::func"

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