Expose DB-Library version as \PDO::DBLIB_ATTR_VERSION attribute on \PDO instance

ext/pdo_dblib/dblib_driver.c

@@ -281,6 +281,10 @@ static int dblib_get_attribute(pdo_dbh_t *dbh, zend_long attr, zval *return_valu
 			ZVAL_BOOL(return_value, ((pdo_dblib_db_handle *)dbh->driver_data)->stringify_uniqueidentifier);
 			break;
 
+		case PDO_DBLIB_ATTR_VERSION:
+			ZVAL_STRING(return_value, dbversion());
+			break;
+
 		default:
 			return 0;
 	}

ext/pdo_dblib/pdo_dblib.c

@@ -194,6 +194,7 @@ PHP_MINIT_FUNCTION(pdo_dblib)
 	REGISTER_PDO_CLASS_CONST_LONG("DBLIB_ATTR_CONNECTION_TIMEOUT", (long) PDO_DBLIB_ATTR_CONNECTION_TIMEOUT);
 	REGISTER_PDO_CLASS_CONST_LONG("DBLIB_ATTR_QUERY_TIMEOUT", (long) PDO_DBLIB_ATTR_QUERY_TIMEOUT);
 	REGISTER_PDO_CLASS_CONST_LONG("DBLIB_ATTR_STRINGIFY_UNIQUEIDENTIFIER", (long) PDO_DBLIB_ATTR_STRINGIFY_UNIQUEIDENTIFIER);
+	REGISTER_PDO_CLASS_CONST_LONG("DBLIB_ATTR_VERSION", (long) PDO_DBLIB_ATTR_VERSION);
 
 	if (FAIL == dbinit()) {
 		return FAILURE;

ext/pdo_dblib/php_pdo_dblib_int.h

@@ -148,6 +148,7 @@ enum {
 	PDO_DBLIB_ATTR_CONNECTION_TIMEOUT = PDO_ATTR_DRIVER_SPECIFIC,
 	PDO_DBLIB_ATTR_QUERY_TIMEOUT,
 	PDO_DBLIB_ATTR_STRINGIFY_UNIQUEIDENTIFIER,
+	PDO_DBLIB_ATTR_VERSION,
 };
 
 #endif

ext/pdo_dblib/tests/dbversion.phpt

@@ -0,0 +1,17 @@
+--TEST--
+PDO_DBLIB: \PDO::DBLIB_ATTR_VERSION exposes a string
+--SKIPIF--
+<?php
+if (!extension_loaded('pdo_dblib')) die('skip not loaded');
+require __DIR__ . '/config.inc';
+?>
+--FILE--
+<?php
+require __DIR__ . '/config.inc';
+
+$version = $db->getAttribute(PDO::DBLIB_ATTR_VERSION);
+var_dump(is_string($version) && strlen($version));
+
+?>
+--EXPECT--
+bool(true)