%define CONVERT_BOOL_IN(lvar,t,invar)
  convert_to_boolean_ex(invar);
  lvar = (t) Z_LVAL_PP(invar);
%enddef

%define CONVERT_INT_IN(lvar,t,invar)
  convert_to_long_ex(invar);
  lvar = (t) Z_LVAL_PP(invar);
%enddef

%define CONVERT_INT_OUT(lvar,invar)
  lvar = (t) Z_LVAL_PP(invar);
%enddef

%define CONVERT_FLOAT_IN(lvar,t,invar)
  convert_to_double_ex(invar);
  lvar = (t) Z_DVAL_PP(invar);
%enddef

%define CONVERT_CHAR_IN(lvar,t,invar)
  convert_to_string_ex(invar);
  lvar = (t) *Z_STRVAL_PP(invar);
%enddef

%define CONVERT_STRING_IN(lvar,t,invar)
  convert_to_string_ex(invar);
  lvar = (t) Z_STRVAL_PP(invar);
%enddef

%define %pass_by_val( TYPE, CONVERT_IN )
%typemap(in) TYPE
{
  CONVERT_IN($1,$1_ltype,$input);
}
%enddef

%fragment("t_output_helper","header") %{
void
t_output_helper( zval **target, zval *o) {
  if ( (*target)->type == IS_ARRAY ) {
    /* it's already an array, just append */
    add_next_index_zval( *target, o );
    return;
  }
  if ( (*target)->type == IS_NULL ) {
    REPLACE_ZVAL_VALUE(target,o,1);
    return;
  }
  zval *tmp;
  ALLOC_INIT_ZVAL(tmp);
  *tmp = **target;
  zval_copy_ctor(tmp);
  array_init(*target);
  add_next_index_zval( *target, tmp);
  add_next_index_zval( *target, o);

}
%}