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<?php class A { public const INSERTTAG = null; public function getInsertTag(): string { if (null === static::INSERTTAG) { throw new \LogicException('Please add a public INSERTTAG constant in your insert tag class'); } return static::INSERTTAG; } } class B extends A { public const INSERTTAG = '{{foo::%s}}'; } class C extends A { } $b = new B(); var_dump($b->getInsertTag()); $c = new C(); var_dump($c->getInsertTag());
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(11) "{{foo::%s}}" Fatal error: Uncaught LogicException: Please add a public INSERTTAG constant in your insert tag class in /in/pRVpe:9 Stack trace: #0 /in/pRVpe(27): A->getInsertTag() #1 {main} thrown in /in/pRVpe on line 9
Process exited with code 255.

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