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Be Carefull While Uploading A file To Server Using PHP

Praveen Tyagi
19/07/2017 0 0

With PHP, it is easy to upload files to the server.

However, with ease comes danger, so always be careful when allowing file uploads.


1. Configure The "php.ini" File:

First, ensure that PHP is configured to allow file uploads.

In your "php.ini" file, search for the file_uploads directive, and set it to On:

file_uploads = On

2. Create The HTML Form:

Next, create an HTML form that allow users to choose the image file they want to upload:

<!DOCTYPE html>
<html>
<body>

<form action="upload.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>

</body>
</html>
 

Some rules to follow for the HTML form above:

  • Make sure that the form uses method="post"
  • The form also needs the following attribute: enctype="multipart/form-data". It specifies which content-type to use when submitting the form

Without the requirements above, the file upload will not work.

Other things to notice:

  • The type="file" attribute of the tag shows the input field as a file-select control, with a "Browse" button next to the input control

The form above sends data to a file called "upload.php", which we will create next.

3. Create The Upload File PHP Script:

The "upload.php" file contains the code for uploading a file:

PHP script explained:

  • $target_dir = "uploads/" - specifies the directory where the file is going to be placed.
  • $target_file specifies the path of the file to be uploaded.
  • $uploadOk=1 is not used yet (will be used later).
  • $imageFileType holds the file extension of the file.
  • Next, check if the image file is an actual image or a fake image.
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