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<?php $drupal_version = 10.0; if (version_compare($drupal_version, '8.0')) { interface I { // In Symfony 5.4 this is: // public static function test($s, $i, $m); // In Symfony 6.0 this is: public static function test(string $s, int $i, mixed $m): mixed; } } else { interface I { // In Symfony 5.4 this is: // public static function test($s, $i, $m); // In Symfony 6.0 this is: public static function test($s, $i, $m); } } if (version_compare($drupal_version, '8.0')) { class A implements I { public static function test(string $s, int $i, mixed $m): mixed { return 'hello'; } } } else { class A implements I { public static function test($s, $i, $m) { return 'hello'; } } } A::test('string', 1, '');