Are there any specific PHP functions or parameters that should be used to avoid issues with extracting data from websites?

When extracting data from websites in PHP, it's important to handle errors and exceptions that may occur during the process. One common issue is dealing with invalid or missing data, which can cause the script to break. To avoid this, you can use functions like `isset()` or `empty()` to check if the data exists before trying to extract it.

// Example of using isset() to avoid issues with extracting data from websites
$data = []; // Assume this is the data extracted from the website

if(isset($data['key'])) {
    // Extract the data if it exists
    $extractedData = $data['key'];
    // Use the extracted data for further processing
} else {
    // Handle the case when the data is missing
    echo "Data not found";
}