通過引用分配由PHP中的方法調用返回的數組？

Question

我需要在每個$message收件人環（收件人是array），如果出現錯誤，unset相應的收件人：

$recipients = &$message->getRecipients(); // array 

// Do this now as arrays is going to be altered in the loop 
$count = count($recipients);   

for($i = 0; $i <= $count; $i++): 

    $response = $messageManager->send($recipients[$i], $content); 

    // If not 200 OK remove the recipient from the message 
    if($response->getStatusCode !== 200) unset($recipients[$i]); 

endfor; 

但是PHP不會讓我這樣做，因爲「只有變量通過參考分配「。有什麼我可以重新分配陣列做，除了：

$recipients = $message->getRecipients(); 

// Loop 

$message->setRecipients($recipients); 

編輯：不能使用的foreach和通過引用傳遞當前元素：

$recipients = array('a', 'b', 'c'); 

foreach($recipients as &$recipient) 
    unset($recipient); 

echo count($recipients); // 3 

Answer 1

你可以這樣做而不是：

$recipients = $message->getRecipients();  

foreach($recipients as $key => $recipient) : 

    $response = $messageManager->send($recipient, $content); 
    if($response->getStatusCode !== 200) unset($recipients[$key]); 

endforeach; 

$message->setRecipients($recipients);