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PHP for the Web: Learn PHP without a Framework

Form Validation for File Uploads

Understand how to enforce file upload requirements in PHP forms by validating if users have submitted a picture when creating or editing entries. Learn to check the uploaded file's MIME type using finfo to confirm it is a JPG image and display appropriate error messages. This lesson helps you secure and improve user input handling for file uploads in PHP applications.

We'll cover the following...

Checking if the user has uploaded a picture

So far, providing a picture was optional. What if we want to force the user to upload a picture? We will have to cover two scenarios:

  1. When the user is creating a new tour, we should verify that the user has uploaded a picture.
  2. When the user is editing a tour, we should verify that the user has uploaded a picture before or that they are uploading a picture now.

Instead of implementing a similar check in two different files, let’s make this part of the validation function we already have in tour-crud.php ...