PHP foreach 在 foreach 循环中

Question

我有这么长的 foreach 代码，我想用它来获取文件夹和子文件夹 ID，以便能够删除它们。

// 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.', ';
                }
            }
        }
    }
}

这段代码的问题在于，我必须为我想要进行的每次迭代编写 foreach 语句。 我如何编写一个简单的循环或 function 来执行一次。 谢谢。

Answer 1

您可以将它放在一个方法中并使您的方法递归，因为可能存在动态嵌套调用，并且我们不确定要编写多少 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);
    }
}