How to attach pdf in mail in Magento 2.4

Question

I have custom form with add file button. Once user submit the form i need to sent form details with pdf in mail.

I tried different solutions.

and i follow this - Magento 2.4.2 How to attched PDF in Email?

but i got error like

1 exception(s):
Exception #0 (ReflectionException): Class Zend\Mime\PartFactory does not exist

so i used Laminas in place of zend then i face same error like

1 exception(s):
Exception #0 (ReflectionException): Class Laminas\Mime\PartFactory does not exist

Answer 1

Magento2.4 does not provide addattachment function in TransportBuilder Class, You need to build it.

 public function __construct(         
         ...
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \{{vendor}}\{{module}}\Model\Mail\Template\TransportBuilder $transportBuilder
   
    {

        $this->_scopeConfig = $scopeConfig;
        $this->_transportBuilder = $transportBuilder;
       
        ....
    }
    public function execute()
    {       
         $templateOptions = [
          'area' => \Magento\Framework\App\Area::AREA_FRONTEND,
          'store' => 1
        ];
        $templateVars = [
            'var1'      => 'value1',
            'var2'      => 'value2',
            'var3'      => 'value3',
            'var4'      => 'value4'
        ];
        $filePath = '/home/basic/Desktop/test.pdf';  //get your pdf file path
        $fileName = "filename.pdf";  //set your email attachment pdf name
        $fromEmail = "formemail@gmail.com"; //set from email
        $fromName = 'your name'; // set from name
        $fromdata = ['email' => $fromEmail, 'name' => $fromName];                
        $to =  $this->_scopeConfig->getValue(
            'contact/email/recipient_email',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );                     
        $emailtempalte = 'email_tempalte'; //set our email template
        $transport = $this->_transportBuilder->setTemplateIdentifier($emailtempalte)
                ->setTemplateOptions($templateOptions)
                ->setTemplateVars($templateVars)
                ->addAttachment(file_get_contents($filePath),$fileName ,'application/pdf')
                ->setFrom($fromdata)
                ->addTo($to)
                ->getTransport();
        $transport->sendMessage();
        echo "message sent successfully with attachment";

    }
}

create new TransportBuilder class and extend it with magento \Magento\Framework\Mail\Template\TransportBuilder class

namespace {{vendor}}\{{module}}\Model\Mail\Template;
class TransportBuilder extends \Magento\Framework\Mail\Template\TransportBuilder
{    
    protected $message;
    public function addAttachment($content, $fileName, $fileType)
    {
        $this->message->setBodyAttachment($content, $fileName, $fileType);
        return $this;
    }
    protected function prepareMessage()
    {
        parent::prepareMessage();
        $this->message->setPartsToBody();
        return $this;
    }
}

Execute upgrade and clean cache command and check it.

Ref Link