如何在 php 中创建临时文件以通过电子邮件发送它们？

Question

我有这段代码可以让我从 base64 编码的 XML 文件中检索字符串。 我把它放在一个 TXT 文件中，然后我对其进行解码以获得所需的 PDF。 然后我将此 PDF 作为附件发送并在数据库中插入 base64 字符串。然后我从文件夹中删除 TXT 文件和 PDF。

一切正常。但我想要一个解决方案，不在服务器上创建这些文件然后删除它们。

我正在寻找更安全的解决方案，我尝试了tmpfile 功能但文件没有通过邮件发送，因为它被直接删除。

你能帮帮我吗？

<?php

            //Function to keep only the content of the <GraphicImage> tags
            function multiSplit($string)
                {
                    $output = array();
                    $cols = explode("<GraphicImage>", $string);

                foreach ($cols as $col)
                {
                    $dashcols = explode("</GraphicImage>", $col);
                    $output[] = $dashcols[0];
                }
                
                return $output;
            }

            $envoi = $submission_id.'_envoi';
            
            //We put the content of the tags in the variable $DHL
            $DHL = multiSplit($output);

            //We create two unique file names  
            $filename1 = $envoi.'.txt';
            $filename2 = $envoi.'.pdf';

            //We write the content of the tags in the txt file 
            $file1 = "D:/Data/Sites/sav/API_label/TXT/$filename1";                       
            file_put_contents($file1, print_r($DHL[1], true) . PHP_EOL, FILE_APPEND | LOCK_EX);

            
            $pdf_base64 = $file1;
            //Get File content from txt file
            $pdf_base64_handler = fopen($pdf_base64,'r');
            $pdf_content = fread ($pdf_base64_handler,filesize($pdf_base64));
            fclose ($pdf_base64_handler);
            //Decode pdf content
            $pdf_decoded = base64_decode ($pdf_content);
            //Write data back to pdf file
            $pdf = fopen ("D:/Data/Sites/sav/API_label/PDF/$filename2",'w');
            fwrite ($pdf,$pdf_decoded);
            //close output file
            fclose ($pdf);
            // echo 'Done';

             //SendGrid Part
             $email = new Mail();
             $email->setFrom("test@test.com", "Sender");
             $email->addTo("$EMAIL", "Recipient");
             $email->setSubject("Etiquettes DHL");
             $email->addContent("text/html", "<strong>Hello</strong>");
 
             $file_encoded = base64_encode(file_get_contents("D:/Data/Sites/sav/retours/API_label/PDF/$filename2"));
             $email->addAttachment($file_encoded, "application/pdf", "$filename2", "attachment");
 
 
             $sendgrid = new \SendGrid('SG.m7481IOix24');
             try {
                 $response = $sendgrid->send($email);

             } catch (Exception $e) {
                 // echo 'Caught exception: ' .  $e->getMessage() . "\n";
             }   

             //Insertion of the values in the database
             try {
                // Connect to db
                $db = new db('mysql:dbname=jotform; host=localhost', 'user', 'password');
                $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

                // Set SQL
                $sql = 'INSERT INTO DHL (submission_id, formID, identite, email, adresse, telephone, label_envoi, commercial_invoice) 
                VALUES (:submission_id, :formID, :NOM, :EMAIL, :ADRESSE, :TELEPHONE, :file_encoded, :COMMERCIAL_INVOICE)';

                // Prepare query
                $query = $db->prepare($sql);

                // Execute query
                $query->execute(array(':submission_id' => $submission_id, ':formID' => $formID, ':NOM' => $NOM, ':EMAIL' => $EMAIL, ':ADRESSE' => $ADRESSE, ':TELEPHONE' => $TELEPHONE, 
                ':file_encoded' => $file_encoded, ':COMMERCIAL_INVOICE' => $COMMERCIAL_INVOICE));
            } catch (PDOException $e) {
                echo 'Error: ' . $e->getMessage();
            } 
            
            //Deleting txt and pdf files
            //PDF
            unlink("D:/Data/Sites/sav/API_label/PDF/$filename2");

            //TXT
            unlink("D:/Data/Sites/sav/API_label/TXT/$filename1"); 

Answer 1

除非我误解了某些内容，否则这两个临时文件似乎没有添加任何价值并且可以删除 - 相反，您可以直接使用写入文件的变量作为后续步骤的输入过程。

此版本应该完成相同的过程而不写入任何文件：

//Function to keep only the content of the <GraphicImage> tags
function multiSplit($string) {
  $output = array();
  $cols = explode("<GraphicImage>", $string);

  foreach($cols as $col) {
    $dashcols = explode("</GraphicImage>", $col);
    $output[] = $dashcols[0];
  }

  return $output;
}

$envoi = $submission_id.'_envoi';
$filename2 = $envoi.'.pdf';

//We put the content of the tags in the variable $DHL
$DHL = multiSplit($output);

//We write the content of the tags
$print1 = print_r($DHL[1], true).PHP_EOL;

//Decode pdf content
$pdf_decoded = base64_decode($print1);

//SendGrid Part
$email = new Mail();
$email->setFrom("test@test.com", "Sender");
$email->addTo("$EMAIL", "Recipient");
$email->setSubject("Etiquettes DHL");
$email->addContent("text/html", "<strong>Hello</strong>");

$file_encoded = base64_encode($pdf_decoded);
$email->addAttachment($file_encoded, "application/pdf", "$filename2", "attachment");

$sendgrid = new \SendGrid('SG.m7481IOix24');

try {
  $response = $sendgrid->send($email);

} catch (Exception $e) {
  // echo 'Caught exception: ' .  $e->getMessage() . "\n";
}

//Insertion of the values in the database
try {
  // Connect to db
  $db = new db('mysql:dbname=jotform; host=localhost', 'user', 'password');
  $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

  // Set SQL
  $sql = 'INSERT INTO DHL (submission_id, formID, identite, email, adresse, telephone, label_envoi, commercial_invoice)
 VALUES(:submission_id,:formID,:NOM,:EMAIL,:ADRESSE,:TELEPHONE,:file_encoded,:COMMERCIAL_INVOICE)';

  // Prepare query
  $query = $db->prepare($sql);

  // Execute query
  $query->execute(array(':submission_id' => $submission_id, ':formID' => $formID, ':NOM' => $NOM, ':EMAIL' => $EMAIL, ':ADRESSE' => $ADRESSE, ':TELEPHONE' => $TELEPHONE, ':file_encoded' => $file_encoded, ':COMMERCIAL_INVOICE' => $COMMERCIAL_INVOICE));
} catch (PDOException $e) {
  echo 'Error: '.$e->getMessage();
}

我不清楚你为什么使用base64_decode 来读取第一个文件，因为没有证据表明它从一开始就是经过 base64 编码的（它只是一些 XML 上的 print_r 语句的结果，就我可以看到）。因此我也删除了它。