Added idNumber for nl_NL

readme.md

@@ -1276,6 +1276,14 @@ echo $faker->vat; // "NL123456789B01" - Dutch Value Added Tax number
 echo $faker->btw; // "NL123456789B01" - Dutch Value Added Tax number (alias)
 ```
 
+### `Faker\Provider\nl_NL\Person`
+
+```php
+<?php
+
+echo $faker->idNumber; // "111222333" - Dutch Personal identification number (BSN)
+```
+
 ### `Faker\Provider\no_NO\Payment`
 
 ```php

src/Faker/Provider/nl_NL/Person.php

@@ -314,4 +314,37 @@ public static function prefix()
     {
         return static::randomElement(static::$prefix);
     }
+
+    /**
+     * @link https://nl.wikipedia.org/wiki/Burgerservicenummer#11-proef
+     *
+     * @return string
+     */
+    public function idNumber()
+    {
+        $return = '';
+        $nr     = array();
+        $nr[]   = 0;
+        while (count($nr) < 8) {
+            $nr[] = static::randomDigit();
+        }
+        $nr[] = mt_rand(0, 6);
+        if ($nr[7] == 0 && $nr[8] == 0) {
+            $nr[7] = 0;
+        }
+
+        $bsn   = (9 * $nr[8]) + (8 * $nr[7]) + (7 * $nr[6]) + (6 * $nr[5]) + (5 * $nr[4]) + (4 * $nr[3]) + (3 * $nr[2]) + (2 * $nr[1]);
+        $nr[0] = floor($bsn - floor($bsn / 11) * 11);
+        if ($nr[0] > 9) {
+            if ($nr[1] > 0) {
+                $nr[0] = 8;
+                $nr[1]--;
+            } else {
+                $nr[0] = 1;
+                $nr[1]++;
+
+            }
+        }
+        return implode('', array_reverse($nr));
+    }
 }

test/Faker/Provider/nl_NL/PersonTest.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Faker\Test\Provider\nl_NL;
+
+use Faker\Generator;
+use Faker\Provider\nl_NL\Person;
+
+class PersonTest extends \PHPUnit_Framework_TestCase
+{
+    private $faker;
+
+    public function setUp()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new Person($faker));
+        $this->faker = $faker;
+    }
+
+    public function testGenerateValidIdNumber()
+    {
+        $idNumber = $this->faker->idNumber();
+        $this->assertEquals(9, strlen($idNumber));
+
+
+        $sum = -1 * $idNumber % 10;
+        for ($multiplier = 2; $idNumber > 0; $multiplier++) {
+            $val = ($idNumber /= 10) % 10;
+            $sum += $multiplier * $val;
+        }
+        $this->assertTrue($sum != 0 && $sum % 11 == 0);
+    }
+}