diff --git a/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php b/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
index 2bec045b..4b976ae8 100644
--- a/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
@@ -129,10 +129,8 @@ abstract class PKCS8 extends PKCS
 
     /**
      * Returns a SymmetricKey object based on a PBES1 $algo
-     *
-     * @return SymmetricKey
      */
-    private static function getPBES1EncryptionObject(string $algo)
+    private static function getPBES1EncryptionObject(string $algo): SymmetricKey
     {
         $algo = preg_match('#^pbeWith(?:MD2|MD5|SHA1|SHA)And(.*?)-CBC$#', $algo, $matches) ?
             $matches[1] :
@@ -511,7 +509,7 @@ abstract class PKCS8 extends PKCS
      *
      * @param bool $enabled
      */
-    public static function setBinaryOutput($enabled)
+    public static function setBinaryOutput($enabled): void
     {
         self::$binary = $enabled;
     }
@@ -616,7 +614,7 @@ abstract class PKCS8 extends PKCS
 
             $key = ASN1::encodeDER($key, Maps\EncryptedPrivateKeyInfo::MAP);
 
-            if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+            if ($options['binary'] ?? self::$binary) {
                 return $key;
             }
 
@@ -625,7 +623,7 @@ abstract class PKCS8 extends PKCS
                    "-----END ENCRYPTED PRIVATE KEY-----";
         }
 
-        if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+        if ($options['binary'] ?? self::$binary) {
             return $key;
         }
 
@@ -654,7 +652,7 @@ abstract class PKCS8 extends PKCS
 
         $key = ASN1::encodeDER($key, Maps\PublicKeyInfo::MAP);
 
-        if (isset($options['binary']) ? $options['binary'] : self::$binary) {
+        if ($options['binary'] ?? self::$binary) {
             return $key;
         }
 
diff --git a/phpseclib/File/ASN1/Maps/TBSCertList.php b/phpseclib/File/ASN1/Maps/TBSCertList.php
index a0b56f4a..49f216c1 100644
--- a/phpseclib/File/ASN1/Maps/TBSCertList.php
+++ b/phpseclib/File/ASN1/Maps/TBSCertList.php
@@ -31,7 +31,7 @@ abstract class TBSCertList
                 'type' => ASN1::TYPE_INTEGER,
                 'mapping' => ['v1', 'v2'],
                 'optional' => true,
-                'default' => 'v1'
+                'default' => 'v1',
             ],
             'signature' => AlgorithmIdentifier::MAP,
             'issuer' => Name::MAP,
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index cf77cc94..8297e5ea 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -3361,7 +3361,6 @@ class X509
      * Returns the list of extensions if there are any and false if not
      *
      * @param array $csr optional
-     * @return mixed
      */
     public function getRequestedCertificateExtensions(array $csr = null)
     {
diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index b6739e13..5f59ed34 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -3273,7 +3273,7 @@ class SFTP extends SSH2
         }
 
         // if $status isn't SSH_FX_OK it's probably SSH_FX_NO_SUCH_FILE or SSH_FX_PERMISSION_DENIED
-        list($status) = Strings::unpackSSH2('N', $response);
+        [$status] = Strings::unpackSSH2('N', $response);
         if ($status != StatusCode::OK) {
             $this->logError($response, $status);
             return false;
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 9afa3712..ecd1a969 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3520,7 +3520,7 @@ class SSH2
     private function handleDisconnect($payload)
     {
         Strings::shift($payload, 1);
-        list($reason_code, $message) = Strings::unpackSSH2('Ns', $payload);
+        [$reason_code, $message] = Strings::unpackSSH2('Ns', $payload);
         $this->errors[] = 'SSH_MSG_DISCONNECT: ' . self::$disconnect_reasons[$reason_code] . "\r\n$message";
         $this->disconnect_helper(NET_SSH2_DISCONNECT_CONNECTION_LOST);
         throw new ConnectionClosedException('Connection closed by server');
diff --git a/tests/Unit/File/X509/CSRTest.php b/tests/Unit/File/X509/CSRTest.php
index a6809987..2b50519f 100644
--- a/tests/Unit/File/X509/CSRTest.php
+++ b/tests/Unit/File/X509/CSRTest.php
@@ -184,7 +184,7 @@ yGSdZsGMatjn2ld+Ndj3uAYlujyKlqGcAOb53bu+PswH5KXTJJquOJH84UoKraog
         $this->assertTrue(boolval($x509->getPublicKey()->getPadding() & RSA::SIGNATURE_PSS));
     }
 
-    public function testAttributes()
+    public function testAttributes(): void
     {
         $private = RSA::createKey();
         $private = $private->withHash('sha256');
@@ -205,7 +205,7 @@ yGSdZsGMatjn2ld+Ndj3uAYlujyKlqGcAOb53bu+PswH5KXTJJquOJH84UoKraog
         $extensions = [
             ['extnId' => 'id-ce-basicConstraints', 'critical' => true, 'extnValue' => ['cA' => false]],
             ['extnId' => 'id-ce-keyUsage', 'critical' => true, 'extnValue' => ['digitalSignature', 'keyEncipherment']],
-            ['extnId' => 'id-ce-extKeyUsage', 'extnValue' => ['id-kp-serverAuth', 'id-kp-clientAuth']]
+            ['extnId' => 'id-ce-extKeyUsage', 'extnValue' => ['id-kp-serverAuth', 'id-kp-clientAuth']],
         ];
         $subject->setAttribute('pkcs-9-at-extensionRequest', $extensions);
 
diff --git a/tests/Unit/Net/SSH2UnitTest.php b/tests/Unit/Net/SSH2UnitTest.php
index 3ec03152..b329c6ca 100644
--- a/tests/Unit/Net/SSH2UnitTest.php
+++ b/tests/Unit/Net/SSH2UnitTest.php
@@ -42,9 +42,7 @@ class SSH2UnitTest extends PhpseclibTestCase
     public function testBitmapMasks(): void
     {
         $reflection = new \ReflectionClass(SSH2::class);
-        $masks = array_filter($reflection->getConstants(), function ($k) {
-            return str_starts_with($k, 'MASK_');
-        }, ARRAY_FILTER_USE_KEY);
+        $masks = array_filter($reflection->getConstants(), fn ($k) => str_starts_with($k, 'MASK_'), ARRAY_FILTER_USE_KEY);
         $bitmap = 0;
         foreach ($masks as $mask => $bit) {
             $this->assertEquals(0, $bitmap & $bit, "Got unexpected mask {$mask}");