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<?php if(version_compare(PHP_VERSION, '5.0') < 0) { die(); } class Concrete5_Helper_Date { const CONST1 = 'core1'; const CONST2 = 'core2'; public static function test1() { echo "test1: ", self::CONST1, ", ", self::CONST2, "\n"; } } class DateHelper extends Concrete5_Helper_Date { const CONST2 = 'override2'; public static function test2() { echo "test1: ", self::CONST1, ", ", self::CONST2, "\n"; } } DateHelper::test1(); DateHelper::test2();

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