PhpParser\Node\Stmt\ClassMethod::isAbstract PHP Method

    public function isAbstract() {
        return (bool) ($this->flags & Class_::MODIFIER_ABSTRACT);
    }

 protected function enterPublicMethod(Stmt\ClassMethod $node)
 {
     // NS
     $methodName = $node->name;
     $currentFqcn = $this->getCurrentFqcn();
     $declaringFqcn = $this->getReflectionContext()->getDeclaringClass($currentFqcn, $methodName);
     // Vertices
     $signatureIndex = $declaringFqcn . '::' . $methodName;
     $classVertex = $this->findVertex('class', $currentFqcn);
     $signatureVertex = $this->findVertex('method', $signatureIndex);
     $implVertex = $this->findVertex('impl', $currentFqcn . '::' . $methodName);
     // if current class == declaring class, we add the edge
     if ($declaringFqcn == $currentFqcn) {
         $this->getGraph()->addEdge($classVertex, $signatureVertex);
         // C -> M
         if (!$node->isAbstract()) {
             $this->getGraph()->addEdge($signatureVertex, $implVertex);
             // M -> S
             $this->getGraph()->addEdge($implVertex, $classVertex);
             // S -> C
         }
     } else {
         if (!$node->isAbstract()) {
             $this->getGraph()->addEdge($classVertex, $implVertex);
             // C -> S
             $this->getGraph()->addEdge($implVertex, $classVertex);
             // S -> C
         }
     }
     // in any case, we link the implementation to the params
     foreach ($node->params as $idx => $param) {
         // adding edge from signature to param :
         $paramVertex = $this->findVertex('param', $signatureIndex . '/' . $idx);
         // it is possible to not find the param because the signature
         // is external to the source code :
         if (!is_null($paramVertex)) {
             if (!$node->isAbstract()) {
                 $this->getGraph()->addEdge($implVertex, $paramVertex);
                 // S -> P
             }
             if ($currentFqcn === $declaringFqcn) {
                 $this->getGraph()->addEdge($signatureVertex, $paramVertex);
                 // M -> P
                 // now the type of the param :
                 $this->typeHintParam($param, $paramVertex);
             }
         }
     }
 }