What are the best practices for updating PHP scripts to be compatible with PHP 7.0, especially when it comes to mysqli functions?

When updating PHP scripts to be compatible with PHP 7.0, it is important to replace deprecated mysql functions with mysqli functions. This includes updating functions such as mysql_connect() to mysqli_connect(), mysql_query() to mysqli_query(), and mysql_fetch_array() to mysqli_fetch_array(). Additionally, make sure to update any procedural code to object-oriented code where necessary.

// Before updating:
$conn = mysql_connect($servername, $username, $password);
$result = mysql_query("SELECT * FROM table");
while ($row = mysql_fetch_array($result)) {
    // Do something with the data
}

// After updating:
$conn = mysqli_connect($servername, $username, $password);
$result = mysqli_query($conn, "SELECT * FROM table");
while ($row = mysqli_fetch_array($result)) {
    // Do something with the data
}