如何在php关联数组中放置arrayOfString数据类型

I'm learning php trying to get data from a wsdl service. The service method I'm requesting data from requires two parameters, one of which requires an arrayOfstring type. So somehow I'm needing to pass a value like this ACCT_ID[0] to the soapClient method. Here are the parameters the method requires:I'm learning php trying to get data from a wsdl