diff --git a/lib/php/lib/Exception/TApplicationException.php b/lib/php/lib/Exception/TApplicationException.php
index b88fb64424..b489c36a81 100644
--- a/lib/php/lib/Exception/TApplicationException.php
+++ b/lib/php/lib/Exception/TApplicationException.php
@@ -25,6 +25,7 @@
 
 namespace Thrift\Exception;
 
+use Thrift\Protocol\TProtocol;
 use Thrift\Type\TType;
 
 class TApplicationException extends TException
@@ -53,17 +54,17 @@ class TApplicationException extends TException
     public const INVALID_PROTOCOL = 9;
     public const UNSUPPORTED_CLIENT_TYPE = 10;
 
-    public function __construct($message = null, $code = 0)
+    public function __construct(?string $message = null, int $code = 0)
     {
         parent::__construct($message, $code);
     }
 
-    public function read($output)
+    public function read(TProtocol $input): int
     {
-        return $this->readStruct('TApplicationException', self::$tspec, $output);
+        return $this->readStruct('TApplicationException', self::$tspec, $input);
     }
 
-    public function write($output)
+    public function write(TProtocol $output): int
     {
         $xfer = 0;
         $xfer += $output->writeStructBegin('TApplicationException');
diff --git a/lib/php/lib/Exception/TException.php b/lib/php/lib/Exception/TException.php
index 31d14625c0..98f0ec76a5 100644
--- a/lib/php/lib/Exception/TException.php
+++ b/lib/php/lib/Exception/TException.php
@@ -38,13 +38,13 @@
  * Can be called with standard Exception constructor (message, code) or with
  * Thrift Base object constructor (spec, vals).
  *
- * @param mixed $p1 Message (string) or type-spec (array)
- * @param mixed $p2 Code (integer) or values (array)
+ * @param string|array|null $p1 Message (string) or type-spec (array)
+ * @param int|array          $p2 Code (integer) or values (array)
  */
 #[\AllowDynamicProperties]
 class TException extends \Exception
 {
-    public function __construct($p1 = null, $p2 = 0)
+    public function __construct(string|array|null $p1 = null, int|array $p2 = 0)
     {
         if (is_array($p1) && is_array($p2)) {
             $spec = $p1;
@@ -56,7 +56,7 @@ public function __construct($p1 = null, $p2 = 0)
                 }
             }
         } else {
-            parent::__construct((string)$p1, $p2);
+            parent::__construct($p1 ?? '', $p2);
         }
     }
 
diff --git a/lib/php/lib/Exception/TProtocolException.php b/lib/php/lib/Exception/TProtocolException.php
index b16baebfe3..becafdac45 100644
--- a/lib/php/lib/Exception/TProtocolException.php
+++ b/lib/php/lib/Exception/TProtocolException.php
@@ -46,7 +46,7 @@ class TProtocolException extends TException
     public const NOT_IMPLEMENTED = 5;
     public const DEPTH_LIMIT = 6;
 
-    public function __construct($message = null, $code = 0)
+    public function __construct(?string $message = null, int $code = 0)
     {
         parent::__construct($message, $code);
     }
diff --git a/lib/php/lib/Exception/TTransportException.php b/lib/php/lib/Exception/TTransportException.php
index fa3dec1e02..cdb52dda50 100644
--- a/lib/php/lib/Exception/TTransportException.php
+++ b/lib/php/lib/Exception/TTransportException.php
@@ -36,7 +36,7 @@ class TTransportException extends TException
     public const TIMED_OUT = 3;
     public const END_OF_FILE = 4;
 
-    public function __construct($message = null, $code = 0)
+    public function __construct(?string $message = null, int $code = 0)
     {
         parent::__construct($message, $code);
     }