From 8cc3bd03384425688fad4333b4de531a8fce9cc0 Mon Sep 17 00:00:00 2001
From: Fabian Schmengler <fs@integer-net.de>
Date: Thu, 19 Mar 2015 08:38:17 +0100
Subject: [PATCH 1/2] Make calling seed() without parameters seeding the RNG
 with random seed. This fixes issue #538

---
 src/Faker/Generator.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Faker/Generator.php b/src/Faker/Generator.php
index b3c7bc4a8a..1e8e1fabfa 100644
--- a/src/Faker/Generator.php
+++ b/src/Faker/Generator.php
@@ -145,7 +145,11 @@ public function getProviders()
 
     public function seed($seed = null)
     {
-        mt_srand($seed);
+        if ($seed === null) {
+            mt_srand();
+        } else {
+            mt_srand($seed);
+        }
     }
 
     public function format($formatter, $arguments = array())

From 377bbd6076dedaa6e60d0cef1ddb6dea0f2e2cca Mon Sep 17 00:00:00 2001
From: Fabian Schmengler <fs@integer-net.de>
Date: Thu, 19 Mar 2015 08:48:58 +0100
Subject: [PATCH 2/2] Add test case for #538

---
 test/Faker/GeneratorTest.php | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/test/Faker/GeneratorTest.php b/test/Faker/GeneratorTest.php
index 147d9ddd18..9fea4f867a 100644
--- a/test/Faker/GeneratorTest.php
+++ b/test/Faker/GeneratorTest.php
@@ -105,6 +105,21 @@ public function testMagicCallCallsFormatWithArguments()
         $this->assertEquals('bazfoo', $generator->fooFormatterWithArguments('foo'));
     }
 
+    public function testSeed()
+    {
+        $generator = new Generator;
+
+        $generator->seed(0);
+        $mtRandWithSeedZero = mt_rand();
+        $generator->seed(0);
+        $this->assertEquals($mtRandWithSeedZero, mt_rand(), 'seed(0) should be deterministic.');
+
+        $generator->seed();
+        $mtRandWithoutSeed = mt_rand();
+        $this->assertNotEquals($mtRandWithSeedZero, $mtRandWithoutSeed, 'seed() should be different than seed(0)');
+        $generator->seed();
+        $this->assertNotEquals($mtRandWithoutSeed, mt_rand(), 'seed() should not be deterministic.');
+    }
 }
 
 class FooProvider