diff --git a/system/Database/SQLSRV/Connection.php b/system/Database/SQLSRV/Connection.php
index a10fefd2e3c6..f980e3923e48 100755
--- a/system/Database/SQLSRV/Connection.php
+++ b/system/Database/SQLSRV/Connection.php
@@ -141,7 +141,7 @@ public function connect(bool $persistent = false)
         $errors = [];
 
         foreach (sqlsrv_errors(SQLSRV_ERR_ERRORS) as $error) {
-            $errors[] = preg_replace('/(\[.+\]\[.+\](?:\[.+\])?)(.+)/', '$2', $error['message']);
+            $errors[] = (string) preg_replace('/(\[.+\]\[.+\](?:\[.+\])?)(.+)/', '$2', $error['message']);
         }
 
         throw new DatabaseException(implode("\n", $errors));
diff --git a/system/HTTP/CURLRequest.php b/system/HTTP/CURLRequest.php
index 2ecf69cc0242..1e8a1aedbaad 100644
--- a/system/HTTP/CURLRequest.php
+++ b/system/HTTP/CURLRequest.php
@@ -474,7 +474,7 @@ protected function setResponseHeaders(array $headers = [])
                 }
 
                 if (isset($matches[2])) {
-                    $this->response->setStatusCode($matches[2], $matches[3] ?? null);
+                    $this->response->setStatusCode((int) $matches[2], $matches[3] ?? null);
                 }
             }
         }
diff --git a/system/Helpers/text_helper.php b/system/Helpers/text_helper.php
index 8ad9797d1ee9..51b2c7dbafa7 100755
--- a/system/Helpers/text_helper.php
+++ b/system/Helpers/text_helper.php
@@ -598,7 +598,7 @@ function increment_string(string $str, string $separator = '_', int $first = 1):
     {
         preg_match('/(.+)' . preg_quote($separator, '/') . '([0-9]+)$/', $str, $match);
 
-        return isset($match[2]) ? $match[1] . $separator . ($match[2] + 1) : $str . $separator . $first;
+        return isset($match[2]) ? $match[1] . $separator . ((int) $match[2] + 1) : $str . $separator . $first;
     }
 }
 
diff --git a/system/Session/Handlers/MemcachedHandler.php b/system/Session/Handlers/MemcachedHandler.php
index 5e963bf5048a..cc6365264e79 100644
--- a/system/Session/Handlers/MemcachedHandler.php
+++ b/system/Session/Handlers/MemcachedHandler.php
@@ -103,7 +103,7 @@ public function open($path, $name): bool
                 continue;
             }
 
-            if (! $this->memcached->addServer($match[1], $match[2], $match[3] ?? 0)) {
+            if (! $this->memcached->addServer($match[1], (int) $match[2], $match[3] ?? 0)) {
                 $this->logger->error('Could not add ' . $match[1] . ':' . $match[2] . ' to Memcached server pool.');
             } else {
                 $serverList[] = $match[1] . ':' . $match[2];