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Setting up to use the class

From: Uploading Files Securely with PHP

Video: Setting up to use the class

If you worked through the earlier chapters of this course, you Then on line 28 we've got the submit button and the name of the submit button

Setting up to use the class

If you worked through the earlier chapters of this course, you should be familiar with how to use the upload file class. This movie and the next one, are mainly for the benefits of those who've skipped straight to this chapter, or if you need to refresh your memory. To use the class, you need a web page with a form that contains a file input field. In my editing program, I've got open form.php and you can find a copy of this file in the exercise files for this movie. Let's take a quick look at what this file contains.

Above the doctype is a small PHP block, on line 2 max is set to 50 times 1024. 1,024 is the number of bytes in a kilobyte. So this'll be used to set the maximum size of an upload file to 50 kb. Obviously if you want it to be a different value say 100 or 150, all you need to do is to change the 50 and PHP will do the calculation for you. Line 3 result is an empty array.

This will be used to store the results of the upload. And those results will be displayed by the PHP block on lines 14 through to 20 as an unordered list. Now, let's scroll down and look at the form itself. The opening form tag on line 21, action is set to PHP echo server PHP self. What this does is that when the form is submitted the page will just reload itself and it will turn it into a self-processing form.

And we'll have the processing script in the PHP block above the doctype. Method is set to post. This is very important when uploading files. It must be post and not get. The other important thing for uploading files is you must have enctype equals multipart/form-data. This tells the browser to expect files to be uploaded. The other thing for uploading files. On line 23 we have a hidden field. And its name is MAX_FILE_SIZE.

This is a fixed name used by PHP and the value is the number of bytes that you want to limit the maximum size to. So we're going to be using max here. So that means it will be 50 kilobytes or whatever value do you decide to set it to. The file input field is on line 25. It's very important that the file input field should come after this hidden field. If you put them the other way around, the file will still be uploaded, but the maximum size won't be applied.

The name of the file input field is file name, but you don't really need to know the name of the file input field. Because the upload file class deals with that automatically. Then on line 28 we've got the submit button and the name of the submit button is upload. You also need a copy of the class definition, upload file.php which you can find in the exercise files for this movie. It's common convention to store class definitions in a folder called src for source.

So in my testing site I've got a folder called src and if we open that, inside is another folder called foundationphp. We're using a namespaced class so you have a separate sub folder for each namespace. I'm using foundationphp because that's my domain name. And then inside that is the fileuploadfile.php, which contains the class definition. Well another thing that you need is a folder to upload the files to.

I've got one uploaded within my testing site, the folder needs to be writable and if necessary; you should refer to the movie on preparing the upload folder in chapter 1. So that's the set-up for working with the upload file class. In the next movie, I'll show you how to use it.

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Uploading Files Securely with PHP

33 video lessons · 2370 viewers

David Powers
Author

 
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  1. 4m 49s
    1. Welcome
      57s
    2. What you should know before watching this course
      2m 0s
    3. Using the exercise files
      1m 52s
  2. 33m 2s
    1. How PHP handles file uploads
      6m 16s
    2. Examining the $_FILES array
      5m 8s
    3. Setting the maximum file size
      5m 36s
    4. Preparing the upload folder
      3m 18s
    5. Moving the file to its destination
      6m 51s
    6. Limitations on file uploads
      5m 53s
  3. 47m 3s
    1. Planning the class's features
      3m 15s
    2. Creating and using a namespaced class
      5m 25s
    3. Creating the class constructor
      7m 26s
    4. Getting a reference to the uploaded file
      5m 9s
    5. Checking the error level
      5m 7s
    6. Displaying errors and other messages
      4m 51s
    7. Setting and checking the maximum file size
      7m 19s
    8. Strengthening the setMaxSize() method
      8m 31s
  4. 35m 30s
    1. Restricting acceptable MIME types
      5m 27s
    2. Removing spaces from file names
      5m 21s
    3. Restricting acceptable file-name extensions
      6m 10s
    4. Neutralizing potentially dangerous uploads
      5m 54s
    5. Renaming files with duplicate names
      7m 58s
    6. Moving the file to its destination
      4m 40s
  5. 10m 25s
    1. Understanding how the $_FILES array handles multiple files
      4m 42s
    2. Adapting the class to handle both single and multiple uploads
      5m 43s
  6. 38m 15s
    1. Overview of the UploadFile class
      5m 9s
    2. Setting up to use the class
      4m 11s
    3. Using the class
      8m 12s
    4. Reporting errors with multiple uploads
      4m 0s
    5. Displaying the server limits
      4m 51s
    6. Alerting the user about exceeding the server limits
      6m 14s
    7. Changing the class's defaults
      5m 38s
  7. 1m 38s
    1. Goodbye
      1m 38s

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