Uploading files in Laravel - Step-by-Step Execution

Concept Flow - Uploading files

User selects file in form

↓

Form submits POST request

↓

Laravel receives request

↓

Validate file input

↓

Store file

↓

Save file path or info

↓

Return success response

This flow shows how a user uploads a file, Laravel validates and stores it, then responds accordingly.

Execution Sample

Laravel

<?php
public function upload(Request $request) {
  $request->validate(['photo' => 'required|image']);
  $path = $request->file('photo')->store('photos');
  return back()->with('path', $path);
}

This code validates an uploaded image file, stores it in 'photos' folder, and returns the stored path.

Execution Table

Step	Action	Input/Condition	Result	Next Step
1	User selects file	File chosen in form input 'photo'	File ready to upload	2
2	Form submits POST	Request with file data	Request received by Laravel	3
3	Validate file	Check 'photo' is required and is image	Validation passes	4
4	Store file	Call store('photos') on file	File saved in storage/app/photos	5
5	Return response	Return back() with stored path	User redirected with success info	END

💡 Process ends after returning response to user.

Variable Tracker

Variable	Start	After Step 3	After Step 4	Final
$request	Empty request	Contains uploaded file	Contains uploaded file	Contains uploaded file
$path	null	null	'photos/filename.jpg'	'photos/filename.jpg'

Key Moments - 3 Insights

Why do we validate the file before storing it?

Validation ensures the file meets requirements (like being an image). See step 3 in execution_table where validation passes before storing.

What happens if validation fails?

Laravel automatically redirects back with errors. The flow stops at validation (step 3) and does not store the file.

Where is the file stored after upload?

The file is stored in the 'photos' folder inside storage/app, as shown in step 4 of execution_table.

Visual Quiz - 3 Questions

Look at the execution table, what happens at step 3?

A The user selects the file

B The file is stored in the photos folder

C The file input is validated

D The response is returned

💡 Hint

Check the 'Action' and 'Result' columns at step 3 in the execution_table.

At which step does Laravel save the uploaded file?

A Step 4

B Step 3

C Step 2

D Step 5

💡 Hint

Look for the step where 'File saved in storage/app/photos' appears in the Result column.

If the file is not an image, what happens according to the flow?

A The file is stored anyway

B Validation fails and user gets an error

C The file is renamed automatically

D The response returns success

💡 Hint

Refer to the key moment about validation failure and step 3 in execution_table.

Concept Snapshot

Uploading files in Laravel:
- Use a form with file input
- Validate file with $request->validate()
- Store file with $request->file('name')->store('folder')
- Store returns path to saved file
- Return response with success or errors

Full Transcript

Uploading files in Laravel involves the user selecting a file in a form, submitting it via POST. Laravel receives the request and validates the file input to ensure it meets criteria like being an image. If validation passes, Laravel stores the file in a specified folder and returns the path. If validation fails, Laravel redirects back with errors. This process ensures safe and organized file uploads.