Passing A Long Data Type Array from PHP to a Java Web Service

I am working on a php application that interacts with a java web service. The following is one of the function in the web service ;

public PaymentTransactionDTO paymentTransactionDetails(String containerNumber, long serviceIDs, double totalAmount, String prepaidKey, String cardPin)

I am finding difficulties in passing the ServiceIDs argument from PHP since it is long data type. Can anyone advise on how to pass this argument from phhp