What are the best practices for handling file uploads in PHP to prevent unintended uploads of deleted files?

When handling file uploads in PHP, it is important to validate the file before saving it to prevent unintended uploads of deleted files. One way to do this is by checking if the file exists on the server before allowing the upload process to proceed. This can help prevent the accidental re-uploading of files that have been previously deleted. 

// Check if the file exists before allowing the upload
if(file_exists($_FILES['file']['tmp_name'])) {
    // Process the file upload
    move_uploaded_file($_FILES['file']['tmp_name'], 'uploads/' . $_FILES['file']['name']);
    echo 'File uploaded successfully.';
} else {
    echo 'File does not exist or has been deleted.';
}

Keywords

file uploads PHP prevent unintended uploads deleted files

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