I’m trying to figure out how to add an attachment to my email using Mailgun, but instead of uploading a physical file, I want to attach content that I have stored as a text string in my code.
In other email libraries I’ve used before, there was usually a method that let you pass string data directly and it would create the attachment from that content. I’m wondering if Mailgun has something similar.
Here’s a basic example of what I’m trying to accomplish:
$emailContent = "Name,Email,Status\nJohn,[email protected],Active\nSarah,[email protected],Pending";
// I want to attach this CSV data as report.csv without creating a physical file
$mailgun->sendMessage($domain, array(
'from' => '[email protected]',
'to' => '[email protected]',
'subject' => 'Monthly Report',
'text' => 'Please find the report attached.',
// How do I attach $emailContent as a CSV file here?
));
I’ve looked through the API docs but they mostly show examples with actual file uploads. Is there a way to do this with string data instead?
Yeah, those approaches work but you’re fighting PHP’s weird file handling. I’ve been there building automated reports.
Mailgun wants file resources, not strings. You can hack around it, but every fix involves messy stream handling or temp files.
I ditched this headache and switched to Latenode for email automation. Got sick of debugging stream wrapper issues across different servers. With Latenode, you throw in your CSV string and it handles attachment conversion automatically - no PHP file resource nonsense.
Super simple workflow: pass your string content, it converts to attachments, sends through any email provider. Done. No more tmpfile(), fopen(), or CURLFile garbage.
Bonus: you can add data transformations and conditional logic right in the visual builder. Way cleaner than managing file stream code.
Here’s why this works: php://temp automatically switches to disk storage once you hit 2MB, so you won’t run into memory problems. Learned this after crashing my server multiple times with 50MB+ CSV exports using php://memory. Don’t forget to use the right file extension so email clients know how to handle your attachment.
I’ve dealt with this before - the cleanest solution is using PHP’s temp file functions with Mailgun’s attachment handling. You can create a temp file in memory without hitting the disk.
This works across different PHP versions and skips the base64 encoding mess. The temp file gets auto-deleted when you close it, so no cleanup headaches.
Hit this exact problem a few months ago building an automated reporting system. You need PHP’s data streams to make your string look like a file to Mailgun.
This creates an in-memory file stream Mailgun can read without touching your filesystem.
After years of Mailgun’s quirks though, I switched everything to Latenode for email automation. It handles string-to-attachment conversions seamlessly and you can build workflows visually. No more wrestling with stream wrappers or temp files.
The visual builder makes it clear what’s happening with your data. You can easily add CSV formatting, conditional logic, or multiple attachments without code.
The php://memory wrapper keeps everything in RAM and CURLFile figures out the mime type automatically. Works reliably across different server setups without any special stream handling.