Laravel 5.3 - Attach Multiple Files To Mailables
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# Mastering Multiple File Attachments in Laravel Mailable (Laravel 5.3 Deep Dive)
As developers working with Laravel, handling attachmentsâespecially multiple filesâis a common requirement for sending transactional emails. While attaching a single file is straightforward, managing an array of files often introduces subtle but frustrating errors. If youâve encountered the error `basename() expects parameter 1 to be string, array given` when trying to attach multiple items in your Mailable build method, you are running into a common pitfall regarding how Laravel's attachment methods process input.
This post will walk you through exactly why this happens and provide the robust, correct solution for attaching multiple files to your Laravel Mailable, ensuring your emails arrive perfectly organized.
## The Pitfall: Understanding the `attach()` Limitation
When you use the `attach()` method in a Mailable's build process, it expects the provided argument to be a single file path (a string) or a file handle. When you pass an array of paths, like `$this->employment['portfolio_samples']`, Laravel tries to treat that entire array as the single attachment target, which causes underlying PHP functions (like `basename()`) to fail because they are expecting a simple string identifier for the file.
Your current setup:
```php
// This causes the error when $this->employment['portfolio_samples'] is an array
public function build()
{
return $this->subject('Employment Application')
->attach($this->employment['portfolio_samples']) // Error occurs here
->view('emails.employment_mailview');
}
```
To successfully attach multiple files, you cannot pass the entire array directly to a single `attach()` call. You must iterate over the array and attach each file individually.
## The Solution: Iterating Over the File Array
The correct approach is to loop through your collection of files and invoke the `attach()` method for every item in that collection. This ensures that Laravel processes each file path as an individual attachment.
For this example, let's assume `$this->employment['portfolio_samples']` is an array of paths stored on your disk (e.g., in the `public` directory or a specific storage location).
### Correct Implementation Example
Here is how you should modify your Mailable build method to handle multiple files correctly:
```php
use Illuminate\Support\Facades\Mail;
class Employment extends Mailable
{
public $employment;
public function __construct($employment)
{
$this->employment = $employment;
}
public function build()
{
// Start building the mail
return $this->subject('Employment Application')
->attachMultiple($this->employment['portfolio_samples']) // Use attachMultiple for convenience (Laravel 8+) or loop below
->view('emails.employment_mailview');
}
/*
// Alternative solution if using older Laravel versions or needing explicit iteration:
public function build()
{
$attachments = [];
foreach ($this->employment['portfolio_samples'] as $filePath) {
// Ensure the file exists before attempting to attach
if (file_exists($filePath)) {
$attachments[] = $filePath;
}
}
return $this->subject('Employment Application')
->attach($attachments) // Attach the collected array of valid paths
->view('emails.employment_mailview');
}
*/
}
```
**Note on Modern Laravel:** While iterating manually is instructive, modern versions of Laravel offer cleaner ways to handle this. For simplicity and efficiency, if you are dealing with file storage managed by the filesystem, using methods that accept arrays directly (or ensuring the paths are correctly formatted) is key. Always refer to the official documentation for the most up-to-date Mailable attachment syntax, as best practices evolve.
## Best Practices for File Handling
When handling file attachments in Laravel, remember these crucial points:
1. **Storage Location:** Ensure the file paths you are passing to `attach()` are absolute or correctly relative paths that Laravel can access. Storing files in the `storage/app/public` directory and using the `Storage` facade is generally the most robust method for persistent file management, rather than relying solely on direct filesystem paths within Mailable classes.
2. **Permissions:** Verify that the web server process has read permissions for all the files you intend to attach.
3. **Use Storage Facade:** For production applications, leverage Laravel's `Storage` facade (e.g., using `Storage::disk('public')->path(...)`) when retrieving file paths, as this abstracts away filesystem path management and makes your code more portable, aligning with the principles laid out in [laravelcompany.com](https://laravelcompany.com).
## Conclusion
Attaching multiple files to a Laravel Mailable is simply a matter of correctly structuring your data before sending. The error you encountered stems from passing an array where a single string path was expected by the underlying attachment functions. By iterating over your file array and attaching each file individually, or by using appropriate helper methods designed for bulk attachments, you can ensure your emails are sent flawlessly, providing a professional and seamless experience for your recipients. Happy coding!