Check if any of the row fields has been changed. If given arguments, check if value in those fields is changed.

Return value

Bool

Arguments

$field

Technical name of the field that is checked

Full documentation

Check if delivery date has been changed:

if ( $Order->isChanged('delivery_date') ){
    // Delivery date has been modified!
}

Calculate total from price and amount if amount or price has been changed:

if ( $Order->isChanged('amount','price') ){
    $Order->total->calculateValue('amount*price');
}

Save changes, if some changes has been made:

if ( $Order->isChanged() ){
    $Order->save();
}