Fix iliaal#234

ChangeLog

@@ -1,5 +1,6 @@
-[2017-??-??] - Version 1.0.3dev
+[2018-??-??] - Version 1.0.3dev
 	* Fixed crash when trying to read an empty file
+	* Fixed bug with writing references (see issue #234)
 	* Added PECL package.xml to allow installation via pecl
 	* Added ExcelSheet::AS_STRING const to use with write operations (see PR 183 by ederuiter)
 	* Added new methods (requires LibXL 3.8.0)

excel.c

@@ -2366,14 +2366,14 @@ zend_bool php_excel_write_cell(SheetHandle sheet, BookHandle book, int row, int
 {
 	zend_string *data_zs;
 
+	try_again:
 	switch (Z_TYPE_P(data)) {
 		case IS_NULL:
 			if (INI_INT("excel.skip_empty") > 0) {
 				return 1;
 			}
 			if (!format) {
-				FormatHandle fmt = xlBookAddFormat(book, NULL);
-				return xlSheetWriteBlank(sheet, row, col, fmt);
+				return xlSheetWriteBlank(sheet, row, col, NULL);
 			} else {
 				return xlSheetWriteBlank(sheet, row, col, format);
 			}
@@ -2433,16 +2433,12 @@ zend_bool php_excel_write_cell(SheetHandle sheet, BookHandle book, int row, int
 		case IS_FALSE:
 			return xlSheetWriteBool(sheet, row, col, 0, format);
 
-		case IS_ARRAY:
-			php_error_docref(NULL, E_WARNING, "Type mismatch: array not supported for atomic write operation in row %d, column %d", row, col);
-			return 1;
-
-		case IS_OBJECT:
-			php_error_docref(NULL, E_WARNING, "Type mismatch: object not supported for atomic write operation in row %d, column %d", row, col);
-			return 1;
+		case IS_REFERENCE:
+			ZVAL_DEREF(data);
+			goto try_again;
 
-		case IS_RESOURCE:
-			php_error_docref(NULL, E_WARNING, "Type mismatch: resource not supported for atomic write operation in row %d, column %d", row, col);
+		default:
+			php_error_docref(NULL, E_WARNING, "Type mismatch: %s not supported for atomic write operation in row %d, column %d", Z_TYPE_P(data), row, col);
 			return 1;
 	}