https://www.php.net/manual/it/reflectionclass.isabstract.php
PHP: ReflectionClass::isAbstract - Manual
Checks if class is abstract
phpmanual
https://codeql.github.com/codeql-standard-libraries/java/semmle/code/java/Member.qll/predicate.Member$Method$isAbstract.0.html
isAbstract
API documentation for CodeQL