$_FILES for file uploads in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the uploaded file's name.

PHP

<?php
$filename = $_FILES['userfile']['[1]'];
echo $filename;
?>

Drag options to blanks, or click blank then click option'

Aname

Btmp_name

Csize

Dtype

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'tmp_name' instead of 'name' to get the file's original name.

Confusing 'size' or 'type' keys with the file name.

The name key in $_FILES holds the original name of the uploaded file.

2fill in blank

medium

Complete the code to check if the file upload was successful.

PHP

<?php
if ($_FILES['userfile']['[1]'] === 0) {
    echo 'Upload successful';
} else {
    echo 'Upload failed';
}
?>

Drag options to blanks, or click blank then click option'

Atype

Berror

Ctmp_name

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Checking 'size' or 'tmp_name' instead of 'error' to verify upload success.

Using 'type' key to check for errors.

The error key in $_FILES holds an error code. A value of 0 means no error.

3fill in blank

hard

Fix the error in the code to move the uploaded file to the 'uploads/' directory.

PHP

<?php
$uploadDir = 'uploads/';
$uploadFile = $uploadDir . basename($_FILES['userfile']['[1]']);
if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadFile)) {
    echo 'File is valid, and was successfully uploaded.';
} else {
    echo 'Possible file upload attack!';
}
?>

Drag options to blanks, or click blank then click option'

Asize

Berror

Ctmp_name

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'tmp_name' inside basename() instead of 'name'.

Confusing 'error' or 'size' keys for file name.

The basename function needs the original file name, which is in the name key.

4fill in blank

hard

Fill both blanks to create an array of file sizes for all uploaded files in a multiple upload form.

PHP

<?php
$fileSizes = [1]['[2]'];
?>

Drag options to blanks, or click blank then click option'

A$_FILES['userfile']['size']

B$_FILES['userfile']

Csize

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' instead of 'size' to get file sizes.

Using the wrong variable for the files array.

To get all file sizes in a multiple upload, use $_FILES['userfile']['size']. Here, $_FILES['userfile'] is the array, and 'size' is the key.

5fill in blank

hard

Fill all three blanks to check if the uploaded file is a JPEG image and its size is less than 2MB.

PHP

<?php
if ($_FILES['userfile']['[1]'] === 'image/jpeg' && $_FILES['userfile']['[2]'] < [3]) {
    echo 'Valid JPEG file under 2MB.';
} else {
    echo 'Invalid file.';
}
?>

Drag options to blanks, or click blank then click option'

Atype

Bsize

C2097152

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'error' instead of 'type' to check MIME type.

Comparing size to 2 instead of 2MB in bytes.

The type key holds the MIME type, size holds the file size in bytes, and 2MB equals 2097152 bytes.