Optimized phpdoc & code (#6976)

Author: rookiexxk

src/ManagesTransactions.php

@@ -84,6 +84,8 @@ public function transactionLevel(): int
 
     /**
      * Create a transaction within the database.
+     *
+     * @throws Throwable
      */
     protected function createTransaction(): void
     {
@@ -101,7 +103,7 @@ protected function createTransaction(): void
     /**
      * Create a save point within the database.
      */
-    protected function createSavepoint()
+    protected function createSavepoint(): void
     {
         $this->exec(
             $this->compileSavepoint('trans' . ($this->transactions + 1))
@@ -113,7 +115,7 @@ protected function createSavepoint()
      *
      * @throws Throwable
      */
-    protected function handleBeginTransactionException(Throwable $e)
+    protected function handleBeginTransactionException(Throwable $e): void
     {
         if ($this->causedByLostConnection($e)) {
             $this->reconnect();
@@ -127,7 +129,7 @@ protected function handleBeginTransactionException(Throwable $e)
     /**
      * Perform a rollback within the database.
      */
-    protected function performRollBack(int $toLevel)
+    protected function performRollBack(int $toLevel): void
     {
         if ($toLevel == 0) {
             $this->call('rollBack');

src/MySQLConnection.php

@@ -207,7 +207,7 @@ protected function buildDsn(array $config): string
     /**
      * Configure the connection character set and collation.
      */
-    protected function configureCharset(PDO $connection, array $config)
+    protected function configureCharset(PDO $connection, array $config): void
     {
         if (isset($config['charset'])) {
             $connection->prepare(sprintf("set names '%s'%s", $config['charset'], $this->getCollation($config)))->execute();