How can the enctype attribute in a form affect file uploads in PHP?

The enctype attribute in a form specifies how the form data should be encoded when submitting it to the server. For file uploads in PHP, you need to set the enctype attribute to "multipart/form-data" in order to properly handle file uploads. Without setting the enctype attribute correctly, PHP will not be able to access the uploaded file data. 

<form action="upload.php" method="post" enctype="multipart/form-data">
  <input type="file" name="file">
  <input type="submit" value="Upload">
</form>

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enctype attribute form file uploads PHP error types

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