How to post array to a php server in android?

I am using DataOutputStream class to send my data as post data to a php server

DataOutputStream dataOutputStreamRegister = new DataOutputStream(connectionToRegister.getOutputStream());
dataOutputStreamRegister.writeBytes("txtUserID="+userName+"&txtPassword="+userPassword+"&ddlCountry="+countryId
                    +"&ddlUniversity="+universityId+"&ddlCourseYear="+courseYearId+"&txtEmail="+userEmail+"&txtInitial="+userInitials
                    +"&txtFname="+userFirstName+"&txtLname="+userLastName+"&txtDob="+userBirthMonth+"/"+userBirthDay+"/"+userBirthYear
                    +"&ddlLevel="+levelId+"&txtSkills="+studentSkills+"&ddlGender="+genderId+"&ddlFraternity="+fraternityId+"&ddlSorority="
                    +sororityId+"&ddlClubs="+paramsText);

The last parameter "ddlClubs" i want to send should be like an array.The code in the php server is as follows

foreach($_POST["ddlClubs"] as $key=>$val){
 ....
}

How should i go about doing this as many techniques i saw included deprecated classes like "defaultHttpClient" and "NameValuePairs"

Thanks everyone for your time.