added some phpunit tests and fixed address/domain detection in email validation.

.idea/php.xml

@@ -8,7 +8,7 @@
   <component name="PhpProjectSharedConfiguration" php_language_level="7" />
   <component name="PhpUnit">
     <phpunit_settings>
-      <PhpUnitSettings />
+      <PhpUnitSettings load_method="PHPUNIT_PHAR" custom_loader_path="" phpunit_phar_path="C:/php7/pear/phpunit-5.3.4.phar" />
     </phpunit_settings>
   </component>
 </project>

Validate.php

@@ -19,16 +19,17 @@ class Validate
         $results = true;
         $email = trim($email); // sanitize before validation
         $split = explode('@', $email);
+        $address = $split[count($split)-1];
 
         // Whitelisted?
         if(isset($lists['whitelist'])) {
-            if(in_array($email, $lists['whitelist']) || in_array($split[1], $lists['whitelist']))
+            if(in_array($email, $lists['whitelist']) || in_array($address, $lists['whitelist']))
                 return true;
         }
 
         // Blacklisted?
         if(isset($lists['blacklist'])) {
-            if(in_array($email, $lists['blacklist']) || in_array($split[1], $lists['blacklist']))
+            if(in_array($email, $lists['blacklist']) || in_array($address, $lists['blacklist']))
                 return false;
         }
 
@@ -43,8 +44,8 @@ class Validate
         }
 
         // check for dns MX entry
-        if($results && $level >= 2) {
+        if($results && $level >= 2 && !Validate::ip($address)) {
-            $results = checkdnsrr($split[1], "MX");
+            $results = checkdnsrr($address, "MX");
         }
 
         return $results;

ValidateTest.php

@@ -0,0 +1,135 @@
+<?php
+
+require_once "Validate.php";
+
+/**
+ * User: Marcel 'CoNfu5eD Naeve <confu5ed@serious-pro.de>
+ * Date: 14.05.2016
+ * Time: 11:25
+ */
+class ValidateTest extends PHPUnit_Framework_TestCase
+{
+    /*
+     * Validate::email(); Tests
+     */
+    public function testEmail_myEmail_level1()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de");
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level2()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 2);
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level1_whitelisted()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 1,["whitelist"=>["confu5ed@serious-pro.de"]]);
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level1_not_in_whitelist()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 1,["whitelist"=>["confu5ed@serious-pro.eu"]]);
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level1_blacklisted()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de",1,["blacklist"=>["confu5ed@serious-pro.de"]]);
+        $this->assertFalse($result);
+    }
+    public function testEmail_myEmail_level1_not_in_blacklist()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 1,["blacklist"=>["confu5ed@serious-pro.eu"]]);
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level2_whitelisted()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 2,["whitelist"=>["confu5ed@serious-pro.de"]]);
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level2_not_in_whitelist()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 2,["whitelist"=>["confu5ed@serious-pro.eu"]]);
+        $this->assertTrue($result);
+    }
+    public function testEmail_myEmail_level2_blacklisted()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 2,["blacklist"=>["confu5ed@serious-pro.de"]]);
+        $this->assertFalse($result);
+    }
+    public function testEmail_myEmail_level2_not_in_blacklist()
+    {
+        $result = Validate::email("confu5ed@serious-pro.de", 2,["blacklist"=>["confu5ed@serious-pro.eu"]]);
+        $this->assertTrue($result);
+    }
+
+    public function testEmail_random1_level1()
+    {
+        $result = Validate::email("tempus.lorem.fringilla@vitae.co.uk");
+        $this->assertTrue($result);
+    }
+    public function testEmail_random2_level1()
+    {
+        $result = Validate::email("Etiam.ligula@et.com");
+        $this->assertTrue($result);
+    }
+    public function testEmail_random3_level1()
+    {
+        $result = Validate::email("orci.tincidunt.adipiscing@famesacturpis.edu");
+        $this->assertTrue($result);
+    }
+    public function testEmail_random4_level1()
+    {
+        $result = Validate::email("_______@example.com");
+        $this->assertTrue($result);
+    }
+    public function testEmail_random5_level1()
+    {
+        $result = Validate::email("nonummy.Fusce.fermentum@ut.org");
+        $this->assertTrue($result);
+    }
+    public function testEmail_random6_level1()
+    {
+        $result = Validate::email('"email"@example.com');
+        $this->assertTrue($result);
+    }
+    public function testEmail_random7_level1()
+    {
+        $result = Validate::email('much."more\ unusual"@example.com');
+        $this->assertTrue($result);
+    }
+    public function testEmail_random8_level1()
+    {
+        $result = Validate::email('very.unusual."@".unusual.com@example.com');
+        $this->assertTrue($result);
+    }
+    public function testEmail_random9_level1()
+    {
+        $result = Validate::email('very."(),:;<>[]".VERY."very@\\"very".unusual@strange.example.com');
+        $this->assertTrue($result);
+    }
+    public function testEmail_random10_level2()
+    {
+        $result = Validate::email('very."(),:;<>[]".VERY."very@\\"very".unusual@serious-pro.de', 2);
+        $this->assertTrue($result);
+    }
+
+    public function testEmail_invalid1_level1()
+    {
+        $result = Validate::email("me@me@serious-pro.de");
+        $this->assertFalse($result);
+    }
+    public function testEmail_invalid2_level1()
+    {
+        $result = Validate::email("me me@serious-pro.de");
+        $this->assertFalse($result);
+    }
+    public function testEmail_invalid3_level1()
+    {
+        $result = Validate::email("me@serious pro.de");
+        $this->assertFalse($result);
+    }
+
+
+
+}