What are the common pitfalls when handling file uploads and database operations in PHP?

One common pitfall when handling file uploads in PHP is not validating the file type and size before saving it to the server, which can lead to security vulnerabilities. To solve this, always validate the file type and size before processing the upload. 

// Validate file type and size before saving to the server
if ($_FILES['file']['type'] == 'image/jpeg' && $_FILES['file']['size'] < 5000000) {
    move_uploaded_file($_FILES['file']['tmp_name'], 'uploads/' . $_FILES['file']['name']);
    echo 'File uploaded successfully!';
} else {
    echo 'Invalid file type or size. Please upload a JPEG image less than 5MB.';
}

Keywords

file uploads database operations PHP SQL injection error handling

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