入門未定義雖然電子郵件使用未安裝

Question

我在這裏使用電子郵件發送，其正常使用，同時添加附件，但同時不帶附件發送郵件的代碼抵消了PHP 0，我得到錯誤的

未定義偏移0

mycode的

if($model->attachment) 
       { 
        $message = Yii::$app->mailer->compose() 
        ->setFrom([ Yii::$app->user->identity->email => 'Fiducial Insurance']) 
        ->setTo($model->email) 
        ->setSubject($model->subject) 
        ->setHtmlBody($model->content); 

        foreach ($model->attachment as $file) 
        { 
         $file->saveAs('emailattachments/' .$file->baseName. '.' . $file->extension); 
         $filename = 'emailattachments/' .$file->baseName. '.' . $file->extension; 
         $message->attach($filename); 
        } 

        $columns = array_map(function($column) { 
         return 'emailattachments/' . $column; 
        }, $model->attachment); 
        $model->attachment = implode(', ', $columns); 

        $message->send(); 

       } 
       else 
       { 
        $message = Yii::$app->mailer->compose() 
        ->setFrom([ Yii::$app->user->identity->email => 'Fiducial Insurance']) 
        ->setTo($model->email) 
        ->setSubject($model->subject) 
        ->setHtmlBody($model->content) 
        ->send(); 
       } 
       $model->save(); 

如何來解決這個錯誤

Answer 1

如果至少有一個附件，則可以將添加附件的行包裝在僅在if中執行的行中。

   //... 
       $hasAttachment = false; 
       foreach ($model->attachment as $file) 
       { 
        $hasAttachment = true; 
        $file->saveAs('emailattachments/' .$file->baseName. '.' . $file->extension); 
        $filename = 'emailattachments/' .$file->baseName. '.' . $file->extension; 
        $message->attach($filename); 
       } 

       if($hasAttachment) { 
        $columns = array_map(function($column) { 
         return 'emailattachments/' . $column; 
        }, $model->attachment); 
        $model->attachment = implode(', ', $columns); 
       } 
       //... 

請嘗試，如果計數（$模型 - >附件）也可以工作。上述方法更像是一種解決方法。

爲什麼會發生這種情況？

$model->attachment == array() == true 

http://php.net/manual/en/language.types.boolean.php

這意味着你的代碼塊，即使數組裏面空空如也。如果變量未定義，您將無法進入代碼塊，您可以使用它來模擬unset($model->attachment)