travis: added PHP 7.4

On error, sqlsrv_fetch_array() returns false, which causes an error due to the return type declaration. This commit handles that by casting such value to null the same way other result drivers do it.

.travis.yml

@@ -3,6 +3,7 @@ php:
     - 7.1
     - 7.2
     - 7.3
+    - 7.4
 
 services:
     - mysql

readme.md

@@ -26,7 +26,7 @@ Install Dibi via Composer:
 composer require dibi/dibi
 ```
 
-The Dibi 4.0 requires PHP version 7.1 and supports PHP up to 7.2. Older Dibi 3.x requires PHP 5.4 and supports PHP up to 7.2.
+The Dibi 4.1 requires PHP version 7.1 and supports PHP up to 7.4.
 
 
 Usage

src/Dibi/Drivers/OracleResult.php

@@ -96,6 +96,7 @@ class OracleResult implements Dibi\ResultDriver
 				'name' => oci_field_name($this->resultSet, $i),
 				'table' => null,
 				'fullname' => oci_field_name($this->resultSet, $i),
+				'type' => $type === 'LONG' ? Dibi\Type::TEXT : null,
 				'nativetype' => $type === 'NUMBER' && oci_field_scale($this->resultSet, $i) === 0 ? 'INTEGER' : $type,
 			];
 		}

src/Dibi/Drivers/SqlsrvResult.php

@@ -61,7 +61,7 @@ class SqlsrvResult implements Dibi\ResultDriver
 	 */
 	public function fetch(bool $assoc): ?array
 	{
-		return sqlsrv_fetch_array($this->resultSet, $assoc ? SQLSRV_FETCH_ASSOC : SQLSRV_FETCH_NUMERIC);
+		return Dibi\Helpers::false2Null(sqlsrv_fetch_array($this->resultSet, $assoc ? SQLSRV_FETCH_ASSOC : SQLSRV_FETCH_NUMERIC));
 	}
 
 

src/Dibi/Fluent.php

@@ -423,7 +423,7 @@ class Fluent implements IDataSource
 		if ($clause === null) {
 			$data = $this->clauses;
 			if ($this->command === 'SELECT' && ($data['LIMIT'] || $data['OFFSET'])) {
-				$args = array_merge(['%lmt %ofs', $data['LIMIT'][0], $data['OFFSET'][0]], $args);
+				$args = array_merge(['%lmt %ofs', $data['LIMIT'][0] ?? null, $data['OFFSET'][0] ?? null], $args);
 				unset($data['LIMIT'], $data['OFFSET']);
 			}
 

src/Dibi/Reflection/Result.php

@@ -28,7 +28,7 @@ class Result
 	/** @var Column[]|null */
 	private $columns;
 
-	/** @var string[]|null */
+	/** @var Column[]|null */
 	private $names;