Produce a better exception message when IntlDateFormatter constructor fails.

Author: sgolemon

ext/intl/dateformat/dateformat_create.cpp

@@ -216,7 +216,7 @@ U_CFUNC PHP_METHOD( IntlDateFormatter, __construct )
 	return_value = getThis();
 	if (datefmt_ctor(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1) == FAILURE) {
 		if (!EG(exception)) {
-			zend_throw_exception(IntlException_ce_ptr, "Constructor failed", 0);
+			zend_throw_exception(IntlException_ce_ptr, ZSTR_VAL(intl_error_get_message(NULL)), intl_error_get_code(NULL));
 		}
 	}
 	zend_restore_error_handling(&error_handling);

ext/intl/tests/dateformat_invalid_timezone.phpt

@@ -0,0 +1,18 @@
+--TEST--
+IntlDateFormat constructor failure
+--INI--
+date.timezone=Mars/Utopia_Planitia
+--SKIPIF--
+<?php
+extension_loaded('intl') || print 'skip';
+--FILE--
+<?php
+
+try {
+  new \IntlDateFormatter('en_US', \IntlDateFormatter::FULL, \IntlDateFormatter::FULL);
+  echo "Wat?";
+} catch (\IntlException $e) {
+  echo $e->getMessage();
+}
+--EXPECT--
+IntlDateFormatter::__construct(): Invalid date.timezone value 'Mars/Utopia_Planitia', we selected the timezone 'UTC' for now.