PHP foreach 在 foreach 循環中

Question

我有這么長的 foreach 代碼，我想用它來獲取文件夾和子文件夾 ID，以便能夠刪除它們。

// first foreach code       
$idsToDelete = $this->entityManager->getRepository(Folders::class)
            ->findBy(['parentId'=>$postId]);
foreach ($idsToDelete as $d){
    $postId = $d->getId(); echo $postId.', ';
    
    //second foreach code in first foreach
    $idsToDelete = $this->entityManager->getRepository(Folders::class)
                    ->findBy(['parentId'=>$postId]);
    foreach ($idsToDelete as $d){
        $postId = $d->getId(); echo $postId.', ';
        
        //third foreach code in second foreach
        $idsToDelete = $this->entityManager->getRepository(Folders::class)
                    ->findBy(['parentId'=>$postId]);
        foreach ($idsToDelete as $d){
            $postId = $d->getId(); 
            echo $postId.', ';
            
            //forth foreach code in third foreach
            $idsToDelete = $this->entityManager->getRepository(Folders::class)
                    ->findBy(['parentId'=>$postId]);
            foreach ($idsToDelete as $d){
                $postId = $d->getId(); echo $postId.', ';
            
                //fith foreach code in forth foreach
                $idsToDelete = $this->entityManager->getRepository(Folders::class)
                        ->findBy(['parentId'=>$postId]);
                foreach ($idsToDelete as $d){
                    $postId = $d->getId(); echo $postId.', ';
                }
            }
        }
    }
}

這段代碼的問題在於，我必須為我想要進行的每次迭代編寫 foreach 語句。 我如何編寫一個簡單的循環或 function 來執行一次。 謝謝。

Answer 1

您可以將它放在一個方法中並使您的方法遞歸，因為可能存在動態嵌套調用，並且我們不確定要編寫多少 static foreachs。

片段：

<?php

public function deleteIDs($postId){
    $idsToDelete = $this->entityManager->getRepository(Folders::class)
            ->findBy(['parentId' => $postId]);
    foreach ($idsToDelete as $d){
       $currPostId = $d->getId(); echo $currPostId.', ';
       $this->deleteIDs($currPostId);
    }
}