10. Uploading Files with Forms

In this chapter, you will learn about uploading files with forms. First, we will review the basic theory like HTTP file upload capability and binary content transfer encoding, and then provide a complete working Image Gallery example showing how to upload images to a web server.

ZF3 components covered in this chapter:

Component	Description
`Zend\Form`	Contains base form model classes.
`Zend\Filter`	Contains various filters classes.
`Zend\Validator`	Implements various validator classes.
`Zend\InputFilter`	Implements a container for filters/validators.

10.1. About HTTP File Uploads
- 10.1.1. HTTP Binary Transfer Encoding
- 10.1.2. $_FILES Super-Global Array in PHP
10.2. Accessing Uploaded Files in ZF3
10.3. File Uploads & ZF3 Form Model
10.4. Validating Uploaded Files
10.5. Filtering Uploaded Files
10.6. InputFilter Container & File Uploads
- 10.6.1. FileInput
- 10.6.2. Executing Validators before Filters
10.7. Controller Action & File Uploads
10.8. Example: Image Gallery
10.9. Summary