diff --git a/packages/Php/src/Rector/RandomFunctionRector.php b/packages/Php/src/Rector/RandomFunctionRector.php
new file mode 100644
index 00000000000..a12fdb7e03f
--- /dev/null
+++ b/packages/Php/src/Rector/RandomFunctionRector.php
@@ -0,0 +1,60 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Php\Rector;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\FuncCall;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+final class RandomFunctionRector extends AbstractRector
+{
+    /**
+     * @var string[]
+     */
+    private $oldToNewFunctionNames = [
+        'getrandmax' => 'mt_getrandmax',
+        'srand' => 'mt_srand',
+        'mt_rand' => 'random_int',
+        'rand' => 'random_int',
+    ];
+
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition(
+            'Changes rand, srand and getrandmax by new md_* alternatives.',
+            [new CodeSample('rand();', 'mt_rand();')]
+        );
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [FuncCall::class];
+    }
+
+    /**
+     * @param FuncCall $funcCallNode
+     */
+    public function refactor(Node $funcCallNode): ?Node
+    {
+        foreach ($this->oldToNewFunctionNames as $oldFunctionName => $newFunctionName) {
+            if ((string) $funcCallNode->name === $oldFunctionName) {
+                $funcCallNode->name = new Node\Name($newFunctionName);
+
+                // special case: random_int(); → random_int(0, getrandmax());
+                if ($newFunctionName === 'random_int' && count($funcCallNode->args) === 0) {
+                    $funcCallNode->args[0] = new Node\Arg(new Node\Scalar\LNumber(0));
+                    $funcCallNode->args[1] = new Node\Arg(new FuncCall(new Node\Name('mt_getrandmax')));
+                }
+
+                return $funcCallNode;
+            }
+        }
+
+        return $funcCallNode;
+    }
+}
diff --git a/packages/Php/tests/Rector/PowToExpRector/PowToExpRectorTest.php b/packages/Php/tests/Rector/PowToExpRector/PowToExpRectorTest.php
index de7ae84d597..3fd9bebfa83 100644
--- a/packages/Php/tests/Rector/PowToExpRector/PowToExpRectorTest.php
+++ b/packages/Php/tests/Rector/PowToExpRector/PowToExpRectorTest.php
@@ -8,7 +8,8 @@ use Rector\Testing\PHPUnit\AbstractRectorTestCase;
 /**
  * @covers \Rector\Php\Rector\PowToExpRector
  *
- * Few tests copied from https://github.com/FriendsOfPHP/PHP-CS-Fixer/commit/14660432d9d0b66bf65135d793b52872cc6eccbc#diff-b412676c923661ef450f4a0903c5442a
+ * Some tests copied from:
+ * - https://github.com/FriendsOfPHP/PHP-CS-Fixer/commit/14660432d9d0b66bf65135d793b52872cc6eccbc#diff-b412676c923661ef450f4a0903c5442a
  */
 final class PowToExpRectorTest extends AbstractRectorTestCase
 {
diff --git a/packages/Php/tests/Rector/RandomFunctionRector/Correct/correct.php.inc b/packages/Php/tests/Rector/RandomFunctionRector/Correct/correct.php.inc
new file mode 100644
index 00000000000..3f725cbaf0e
--- /dev/null
+++ b/packages/Php/tests/Rector/RandomFunctionRector/Correct/correct.php.inc
@@ -0,0 +1,21 @@
+<?php declare(strict_types=1);
+
+random_int(0, mt_getrandmax());
+
+mt_srand($a);
+
+$a = &mt_srand($a);
+
+/* foo */ mt_srand /** bar */ ($a);
+
+a(mt_getrandmax ());
+
+a(random_int(0, mt_getrandmax()));
+
+a(mt_srand());
+
+random_int($d, random_int($a,$b));
+
+random_int($a, \Other\Scope\mt_rand($a));
+
+$a = random_int(1,2) + random_int(3,4);
diff --git a/packages/Php/tests/Rector/RandomFunctionRector/RandomFunctionRectorTest.php b/packages/Php/tests/Rector/RandomFunctionRector/RandomFunctionRectorTest.php
new file mode 100644
index 00000000000..270f604e9fa
--- /dev/null
+++ b/packages/Php/tests/Rector/RandomFunctionRector/RandomFunctionRectorTest.php
@@ -0,0 +1,32 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Php\Tests\Rector\RandomFunctionRector;
+
+use Iterator;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+/**
+ * @covers \Rector\Php\Rector\RandomFunctionRector
+ *
+ * Some tests copied from https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/2.12/tests/Fixer/Alias/RandomApiMigrationFixerTest.php
+ */
+final class RandomFunctionRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideWrongToFixedFiles()
+     */
+    public function test(string $wrong, string $fixed): void
+    {
+        $this->doTestFileMatchesExpectedContent($wrong, $fixed);
+    }
+
+    public function provideWrongToFixedFiles(): Iterator
+    {
+        yield [__DIR__ . '/Wrong/wrong.php.inc', __DIR__ . '/Correct/correct.php.inc'];
+    }
+
+    protected function provideConfig(): string
+    {
+        return __DIR__ . '/config.yml';
+    }
+}
diff --git a/packages/Php/tests/Rector/RandomFunctionRector/Wrong/wrong.php.inc b/packages/Php/tests/Rector/RandomFunctionRector/Wrong/wrong.php.inc
new file mode 100644
index 00000000000..65713de6a20
--- /dev/null
+++ b/packages/Php/tests/Rector/RandomFunctionRector/Wrong/wrong.php.inc
@@ -0,0 +1,21 @@
+<?php declare(strict_types=1);
+
+rand();
+
+srand($a);
+
+$a = &srand($a);
+
+/* foo */ srand /** bar */ ($a);
+
+a(getrandmax ());
+
+a(rand());
+
+a(srand());
+
+rand($d, rand($a,$b));
+
+rand($a, \Other\Scope\mt_rand($a));
+
+$a = rand(1,2) + mt_rand(3,4);
diff --git a/packages/Php/tests/Rector/RandomFunctionRector/config.yml b/packages/Php/tests/Rector/RandomFunctionRector/config.yml
new file mode 100644
index 00000000000..c2d41036d1b
--- /dev/null
+++ b/packages/Php/tests/Rector/RandomFunctionRector/config.yml
@@ -0,0 +1,2 @@
+services:
+    Rector\Php\Rector\RandomFunctionRector: ~