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<?php declare(strict_types=1); trait ControlHelper { public const CONTROL_TEST = 'test'; public function getControl(string $name = self::CONTROL_TEST): void { echo $name; } } interface ControlInterface { public const CONTROL_TEST = 'test'; public function getControl(string $name = self::CONTROL_TEST): void; } abstract class BasePresenter implements ControlInterface { use ControlHelper; public const CONTROL_TEST = 'overriden'; } class Presenter extends BasePresenter { } $presenter = new Presenter(); $presenter->getControl();
Output for 8.5.0 - 8.5.1
Fatal error: BasePresenter and ControlHelper define the same constant (CONTROL_TEST) in the composition of BasePresenter. However, the definition differs and is considered incompatible. Class was composed in /in/oYmEW on line 18 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.2.22 - 8.2.29, 8.3.5 - 8.3.28, 8.4.1 - 8.4.14, 8.4.16
Fatal error: BasePresenter and ControlHelper define the same constant (CONTROL_TEST) in the composition of BasePresenter. However, the definition differs and is considered incompatible. Class was composed in /in/oYmEW on line 18
Process exited with code 255.
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.1.30 - 8.1.33
Fatal error: Traits cannot have constants in /in/oYmEW on line 5
Process exited with code 255.

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