diff --git a/build/php-cs-fixer.php b/build/php-cs-fixer.php
index f51e0f72..359d1f9f 100644
--- a/build/php-cs-fixer.php
+++ b/build/php-cs-fixer.php
@@ -26,7 +26,7 @@ return (new PhpCsFixer\Config())
             'phpdoc_trim_consecutive_blank_line_separation' => true,
             'phpdoc_trim' => true,
 
-            '@PHP71Migration:risky' => true,
-            '@PHP73Migration' => true,
+            '@PHP74Migration' => true,
+            '@PHP74Migration:risky' => true,
         ]
     );
diff --git a/phpseclib/Crypt/Blowfish.php b/phpseclib/Crypt/Blowfish.php
index 980ecb46..05fa4a55 100644
--- a/phpseclib/Crypt/Blowfish.php
+++ b/phpseclib/Crypt/Blowfish.php
@@ -536,11 +536,11 @@ class Blowfish extends BlockCipher
             $p[14] ^ $key[14],
             $p[15] ^ $key[15],
             $p[16] ^ $key[0],
-            $p[17] ^ $key[1]
+            $p[17] ^ $key[1],
         ];
 
         // @codingStandardsIgnoreStart
-        [ $p[0],  $p[1]] = self::encryptBlockHelper(     0,      0, $sbox0, $sbox1, $sbox2, $sbox3, $p);
+        [ $p[0],  $p[1]] = self::encryptBlockHelper(     0, 0, $sbox0, $sbox1, $sbox2, $sbox3, $p);
         [ $p[2],  $p[3]] = self::encryptBlockHelper($p[ 0], $p[ 1], $sbox0, $sbox1, $sbox2, $sbox3, $p);
         [ $p[4],  $p[5]] = self::encryptBlockHelper($p[ 2], $p[ 3], $sbox0, $sbox1, $sbox2, $sbox3, $p);
         [ $p[6],  $p[7]] = self::encryptBlockHelper($p[ 4], $p[ 5], $sbox0, $sbox1, $sbox2, $sbox3, $p);
@@ -605,11 +605,11 @@ class Blowfish extends BlockCipher
             $p[14] ^ $key[14],
             $p[15] ^ $key[15],
             $p[16] ^ $key[0],
-            $p[17] ^ $key[1]
+            $p[17] ^ $key[1],
         ];
 
         // @codingStandardsIgnoreStart
-        [ $p[0],  $p[1]] = self::encryptBlockHelper($data[ 0]         , $data[ 1]         , $sbox0, $sbox1, $sbox2, $sbox3, $p);
+        [ $p[0],  $p[1]] = self::encryptBlockHelper($data[ 0], $data[ 1], $sbox0, $sbox1, $sbox2, $sbox3, $p);
         [ $p[2],  $p[3]] = self::encryptBlockHelper($data[ 2] ^ $p[ 0], $data[ 3] ^ $p[ 1], $sbox0, $sbox1, $sbox2, $sbox3, $p);
         [ $p[4],  $p[5]] = self::encryptBlockHelper($data[ 4] ^ $p[ 2], $data[ 5] ^ $p[ 3], $sbox0, $sbox1, $sbox2, $sbox3, $p);
         [ $p[6],  $p[7]] = self::encryptBlockHelper($data[ 6] ^ $p[ 4], $data[ 7] ^ $p[ 5], $sbox0, $sbox1, $sbox2, $sbox3, $p);
diff --git a/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php b/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php
index a0ced4b7..f42d1ade 100644
--- a/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php
+++ b/phpseclib/Crypt/Common/Formats/Keys/OpenSSH.php
@@ -21,7 +21,6 @@ use ParagonIE\ConstantTime\Base64;
 use phpseclib3\Common\Functions\Strings;
 use phpseclib3\Crypt\AES;
 use phpseclib3\Crypt\Random;
-use phpseclib3\Exception\UnsupportedFormatException;
 
 /**
  * OpenSSH Formatted RSA Key Handler
diff --git a/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php b/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php
index 6b9e4344..52386b46 100644
--- a/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php
+++ b/phpseclib/Crypt/Common/Formats/Keys/PuTTY.php
@@ -131,9 +131,7 @@ abstract class PuTTY
                     throw new \UnexpectedValueException('Key doesn\'t end with ---- END SSH2 PUBLIC KEY ----');
             }
             $lines = array_splice($lines, 1, -1);
-            $lines = array_map(function ($line) {
-                return rtrim($line, "\r\n");
-            }, $lines);
+            $lines = array_map(fn ($line) => rtrim($line, "\r\n"), $lines);
             $data = $current = '';
             $values = [];
             $in_value = false;
diff --git a/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php b/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php
index 84f1d108..c5a59c54 100644
--- a/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php
+++ b/phpseclib/Crypt/EC/Formats/Keys/OpenSSH.php
@@ -110,9 +110,7 @@ abstract class OpenSSH extends Progenitor
         $name = $reflect->getShortName();
 
         $oid = self::$curveOIDs[$name];
-        $aliases = array_filter(self::$curveOIDs, function ($v) use ($oid) {
-            return $v == $oid;
-        });
+        $aliases = array_filter(self::$curveOIDs, fn ($v) => $v == $oid);
         $aliases = array_keys($aliases);
 
         for ($i = 0; $i < count($aliases); $i++) {
diff --git a/phpseclib/Crypt/RSA/Formats/Keys/Raw.php b/phpseclib/Crypt/RSA/Formats/Keys/Raw.php
index ff667dee..46268b88 100644
--- a/phpseclib/Crypt/RSA/Formats/Keys/Raw.php
+++ b/phpseclib/Crypt/RSA/Formats/Keys/Raw.php
@@ -149,15 +149,9 @@ abstract class Raw
             'e' => clone $e,
             'n' => clone $n,
             'd' => clone $d,
-            'primes' => array_map(function ($var) {
-                return clone $var;
-            }, $primes),
-            'exponents' => array_map(function ($var) {
-                return clone $var;
-            }, $exponents),
-            'coefficients' => array_map(function ($var) {
-                return clone $var;
-            }, $coefficients),
+            'primes' => array_map(fn ($var) => clone $var, $primes),
+            'exponents' => array_map(fn ($var) => clone $var, $exponents),
+            'coefficients' => array_map(fn ($var) => clone $var, $coefficients),
         ]);
     }
 
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 120a91f0..8c95121e 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -1103,8 +1103,8 @@ class X509
                 if (isset($parts['query'])) {
                     $path.= '?' . $parts['query'];
                 }
-                fputs($fsock, "GET $path HTTP/1.0\r\n");
-                fputs($fsock, "Host: $parts[host]\r\n\r\n");
+                fwrite($fsock, "GET $path HTTP/1.0\r\n");
+                fwrite($fsock, "Host: $parts[host]\r\n\r\n");
                 $line = fgets($fsock, 1024);
                 if (strlen($line) < 3) {
                     return false;
@@ -1843,9 +1843,7 @@ class X509
                     $value = array_pop($value); // Always strip data type.
                 }
             } elseif (is_object($value) && $value instanceof Element) {
-                $callback = function ($x) {
-                    return '\x' . bin2hex($x[0]);
-                };
+                $callback = fn ($x) => '\x' . bin2hex($x[0]);
                 $value = strtoupper(preg_replace_callback('#[^\x20-\x7E]#', $callback, $value->element));
             }
             $output .= $desc . '=' . $value;
diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 06966255..06d6ec46 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -665,9 +665,7 @@ class BigInteger implements \JsonSerializable
     public static function min(BigInteger ...$nums): BigInteger
     {
         $class = self::$mainEngine;
-        $nums = array_map(function ($num) {
-            return $num->value;
-        }, $nums);
+        $nums = array_map(fn ($num) => $num->value, $nums);
         return new static($class::min(...$nums));
     }
 
@@ -677,9 +675,7 @@ class BigInteger implements \JsonSerializable
     public static function max(BigInteger ...$nums): BigInteger
     {
         $class = self::$mainEngine;
-        $nums = array_map(function ($num) {
-            return $num->value;
-        }, $nums);
+        $nums = array_map(fn ($num) => $num->value, $nums);
         return new static($class::max(...$nums));
     }
 
@@ -755,9 +751,7 @@ class BigInteger implements \JsonSerializable
     public function createRecurringModuloFunction()
     {
         $func = $this->value->createRecurringModuloFunction();
-        return function (BigInteger $x) use ($func) {
-            return new static($func($x->value));
-        };
+        return fn (BigInteger $x) => new static($func($x->value));
     }
 
     /**
@@ -769,8 +763,6 @@ class BigInteger implements \JsonSerializable
      */
     public function bitwise_split(int $split): array
     {
-        return array_map(function ($val) {
-            return new static($val);
-        }, $this->value->bitwise_split($split));
+        return array_map(fn ($val) => new static($val), $this->value->bitwise_split($split));
     }
 }
diff --git a/phpseclib/Math/BigInteger/Engines/GMP.php b/phpseclib/Math/BigInteger/Engines/GMP.php
index 5471f00b..544d20fd 100644
--- a/phpseclib/Math/BigInteger/Engines/GMP.php
+++ b/phpseclib/Math/BigInteger/Engines/GMP.php
@@ -537,9 +537,7 @@ class GMP extends Engine
     public function createRecurringModuloFunction(): \Closure
     {
         $temp = $this->value;
-        return function (GMP $x) use ($temp) {
-            return new GMP($x->value % $temp);
-        };
+        return fn (GMP $x) => new GMP($x->value % $temp);
     }
 
     /**
diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 52c8c2e8..b96aa7e9 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -2183,7 +2183,7 @@ class SFTP extends SSH2
                         } elseif (is_callable($local_file)) {
                             $local_file($temp);
                         } else {
-                            fputs($fp, $temp);
+                            fwrite($fp, $temp);
                         }
                         if (is_callable($progressCallback)) {
                             call_user_func($progressCallback, $offset);
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 7dd2010e..09456c01 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -1172,7 +1172,7 @@ class SSH2
         $this->identifier = $this->generate_identifier();
 
         if ($this->send_id_string_first) {
-            fputs($this->fsock, $this->identifier . "\r\n");
+            fwrite($this->fsock, $this->identifier . "\r\n");
         }
 
         /* According to the SSH2 specs,
@@ -1251,7 +1251,7 @@ class SSH2
         }
 
         if (!$this->send_id_string_first) {
-            fputs($this->fsock, $this->identifier . "\r\n");
+            fwrite($this->fsock, $this->identifier . "\r\n");
         }
 
         if (!$this->send_kex_first) {
@@ -3264,18 +3264,18 @@ class SSH2
                     $cmf = ord($payload[0]);
                     $cm = $cmf & 0x0F;
                     if ($cm != 8) { // deflate
-                        user_error("Only CM = 8 ('deflate') is supported ($cm)");
+                        trigger_error("Only CM = 8 ('deflate') is supported ($cm)");
                     }
                     $cinfo = ($cmf & 0xF0) >> 4;
                     if ($cinfo > 7) {
-                        user_error("CINFO above 7 is not allowed ($cinfo)");
+                        trigger_error("CINFO above 7 is not allowed ($cinfo)");
                     }
                     $windowSize = 1 << ($cinfo + 8);
 
                     $flg = ord($payload[1]);
                     //$fcheck = $flg && 0x0F;
                     if ((($cmf << 8) | $flg) % 31) {
-                        user_error('fcheck failed');
+                        trigger_error('fcheck failed');
                     }
                     $fdict = boolval($flg & 0x20);
                     $flevel = ($flg & 0xC0) >> 6;
@@ -3930,7 +3930,7 @@ class SSH2
         $packet .= $this->encrypt && $this->encrypt->usesNonce() ? $this->encrypt->getTag() : $hmac;
 
         $start = microtime(true);
-        $sent = @fputs($this->fsock, $packet);
+        $sent = @fwrite($this->fsock, $packet);
         $stop = microtime(true);
 
         if (defined('NET_SSH2_LOGGING')) {
@@ -4056,7 +4056,7 @@ class SSH2
                     $realtime_log_size = strlen($entry);
                     $realtime_log_wrap = true;
                 }
-                fputs($realtime_log_file, $entry);
+                fwrite($realtime_log_file, $entry);
         }
     }
 
@@ -4195,9 +4195,7 @@ class SSH2
                     $output .= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0  ';
                 }
                 $fragment = Strings::shift($current_log, $this->log_short_width);
-                $hex = substr(preg_replace_callback('#.#s', function ($matches) {
-                    return $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT);
-                }, $fragment), strlen($this->log_boundary));
+                $hex = substr(preg_replace_callback('#.#s', fn ($matches) => $this->log_boundary . str_pad(dechex(ord($matches[0])), 2, '0', STR_PAD_LEFT), $fragment), strlen($this->log_boundary));
                 // replace non ASCII printable characters with dots
                 // http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
                 // also replace < with a . since < messes up the output on web browsers
diff --git a/phpseclib/System/SSH/Agent.php b/phpseclib/System/SSH/Agent.php
index 20a93d99..954fdd56 100644
--- a/phpseclib/System/SSH/Agent.php
+++ b/phpseclib/System/SSH/Agent.php
@@ -36,7 +36,6 @@ namespace phpseclib3\System\SSH;
 
 use phpseclib3\Common\Functions\Strings;
 use phpseclib3\Crypt\PublicKeyLoader;
-use phpseclib3\Crypt\RSA;
 use phpseclib3\Exception\BadConfigurationException;
 use phpseclib3\Net\SSH2;
 use phpseclib3\System\SSH\Agent\Identity;
@@ -152,7 +151,7 @@ class Agent
         }
 
         $packet = pack('NC', 1, self::SSH_AGENTC_REQUEST_IDENTITIES);
-        if (strlen($packet) != fputs($this->fsock, $packet)) {
+        if (strlen($packet) != fwrite($this->fsock, $packet)) {
             throw new \RuntimeException('Connection closed while requesting identities');
         }
 
diff --git a/phpseclib/System/SSH/Agent/Identity.php b/phpseclib/System/SSH/Agent/Identity.php
index c3920196..0bb770cd 100644
--- a/phpseclib/System/SSH/Agent/Identity.php
+++ b/phpseclib/System/SSH/Agent/Identity.php
@@ -264,7 +264,7 @@ class Identity implements PrivateKey
             $this->flags
         );
         $packet = Strings::packSSH2('s', $packet);
-        if (strlen($packet) != fputs($this->fsock, $packet)) {
+        if (strlen($packet) != fwrite($this->fsock, $packet)) {
             throw new \RuntimeException('Connection closed during signing');
         }
 
diff --git a/tests/Functional/Net/SFTPStreamTest.php b/tests/Functional/Net/SFTPStreamTest.php
index c219f53d..d38ce4ea 100644
--- a/tests/Functional/Net/SFTPStreamTest.php
+++ b/tests/Functional/Net/SFTPStreamTest.php
@@ -40,7 +40,7 @@ class SFTPStreamTest extends SFTPTestCase
             'sftp' => ['session' => $this->sftp],
         ]);
         $fp = fopen($this->buildUrl('te#st.txt'), 'wb', false, $context);
-        fputs($fp, 'zzzz');
+        fwrite($fp, 'zzzz');
         fclose($fp);
 
         $this->assertContains('te#st.txt', $this->sftp->nlist());
diff --git a/tests/PsalmBaselineTest.php b/tests/PsalmBaselineTest.php
index ec33f61b..c12045c4 100644
--- a/tests/PsalmBaselineTest.php
+++ b/tests/PsalmBaselineTest.php
@@ -34,7 +34,7 @@ class PsalmBaselineTest extends TestCase
         /** @var array{level: int, type: string, tag: string, attributes: array{OCCURRENCES?: int}} $element */
         foreach ($values as $element) {
             if ($element['level'] === 3 && ($element['type'] === 'open' || $element['type'] === 'complete')) {
-                $errorCounts[$element['tag']] = $errorCounts[$element['tag']] ?? 0;
+                $errorCounts[$element['tag']] ??= 0;
                 $occurrences = $element['attributes']['OCCURRENCES'] ?? 1;
                 $errorCounts[$element['tag']] += $occurrences;
             }
diff --git a/tests/Unit/Crypt/AES/TestCase.php b/tests/Unit/Crypt/AES/TestCase.php
index 98013461..6a984aaa 100644
--- a/tests/Unit/Crypt/AES/TestCase.php
+++ b/tests/Unit/Crypt/AES/TestCase.php
@@ -178,9 +178,7 @@ abstract class TestCase extends PhpseclibTestCase
      */
     public function continuousBufferBatteryCombosWithoutSingleCombos(): array
     {
-        return array_filter($this->continuousBufferBatteryCombos(), function (array $continuousBufferBatteryCombo) {
-            return count($continuousBufferBatteryCombo[2]) > 1;
-        });
+        return array_filter($this->continuousBufferBatteryCombos(), fn (array $continuousBufferBatteryCombo) => count($continuousBufferBatteryCombo[2]) > 1);
     }
 
     /**
diff --git a/tests/Unit/Crypt/EC/KeyTest.php b/tests/Unit/Crypt/EC/KeyTest.php
index c8fa9d81..f6118402 100644
--- a/tests/Unit/Crypt/EC/KeyTest.php
+++ b/tests/Unit/Crypt/EC/KeyTest.php
@@ -568,7 +568,7 @@ MIIEDwIBADATBgcqhkjOPQIBBggqhkjOPQMBBwSCA/MwggPvAgEBBIID6P//////
         $this->assertSameNL($raw, $key->toString('MontgomeryPrivate'));
     }
 
-    public function testOpenSSHEncryptedCreation()
+    public function testOpenSSHEncryptedCreation(): void
     {
         $key = EC::createKey('Ed25519');
         $key = $key->withPassword('test')->toString('OpenSSH');