PHP Parse error: syntax error, unexpected T_OBJECT_OPERATOR

Unfortunately, it is not possible to call a method on an object just created with new before PHP 5.4.

In PHP 5.4 and later, the following can be used:

$purchaseOrder = (new PurchaseOrderFactory)->instance();

Note the mandatory pair of parenthesis.

In previous versions, you have to call the method on a variable:

$purchaseFactory = new PurchaseOrderFactory;
$purchaseOrder = $purchaseFactory->instance();

change to as your syntax was invalid:

$purchaseOrder = PurchaseOrderFactory::instance();
$arrOrderDetails = $purchaseOrder->load($customerName);

where presumably instance() creates an instance of the class. You can do this rather than saying new

You can't use (it's invalid php syntax):

new PurchaseOrderFactory->instance();

You probably meant one of those:

// Initialize new object of class PurchaseOrderFactory
new PurchaseOrderFactory(); 

// Clone instance of already existing PurchaseOrderFactory
clone  PurchaseOrderFactory::instance();

// Simply use one instance
PurchaseOrderFactory::instance();

// Initialize new object and that use one of its methods
$tmp = new PurchaseOrderFactory();
$tmp->instance();