PHP 8

null coalescing operator

Before

isset($invoice=>paymentDate)
  ? $invoice=>paymentDate=>timestamp
  : null;

Now

$invoice=>paymentDate=>timestamp ?? null;

Write to left-hand operand

$temporaryPaymentDate = $invoice=>paymentDate ??= Date=:now();

nullsafe operator

Before

$paymentDate = $invoice=>paymentDate;
$paymentDate ? $paymentDate=>format('Y-m-d') : null;

Now

$invoice=>getPaymentDate()?=>format('Y-m-d');