What are some best practices for handling file manipulation tasks in PHP to ensure data integrity and security?

Issue: When performing file manipulation tasks in PHP, it is important to ensure data integrity and security to prevent unauthorized access or data corruption. Best practices for handling file manipulation tasks in PHP include: 1. Always sanitize user input to prevent malicious file names or paths. 2. Use file permissions to restrict access to files and directories. 3. Validate file types and sizes before processing them. PHP Code snippet: 

// Sanitize user input
$filename = filter_var($_POST['filename'], FILTER_SANITIZE_STRING);

// Set file permissions
chmod($filename, 0644);

// Validate file type and size
if ($_FILES['file']['type'] == 'image/jpeg' && $_FILES['file']['size'] < 1000000) {
    move_uploaded_file($_FILES['file']['tmp_name'], $filename);
    echo 'File uploaded successfully.';
} else {
    echo 'Invalid file type or size.';
}

Keywords

file manipulation data integrity security PHP functions error handling

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