What are the potential pitfalls of using array_rand() and mysql_fetch_array() functions in PHP?

Using array_rand() to select a random element from an array may not be the most efficient method, especially if the array is large. Similarly, using mysql_fetch_array() to fetch results from a MySQL database query may not handle errors or data properly. To address these issues, consider using a more efficient method for selecting random elements from an array, such as array_rand() and handle errors properly when fetching results from a database query.

// Selecting a random element from an array using a more efficient method
$randomKey = array_rand($array);

// Fetching results from a MySQL database query and handling errors properly
$result = mysqli_query($connection, "SELECT * FROM table");
if($result){
    while($row = mysqli_fetch_array($result)){
        // Process the fetched data here
    }
} else {
    echo "Error: " . mysqli_error($connection);
}