diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f7f520e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.idea
+/vendor/
+composer.lock
diff --git a/README.md b/README.md
index b887109..686f060 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # PHP Random User Agent Generator
-Written in PHP, this script will generate real User Agent strings with optional capabilities to specify OS, Browser, Mobile, ect. simply by passing a parameter to the function called to generate the User Agent string. Created with the intentions of eliminating footprints while scraping the web for content using cURL because a truly solution to generate a truly random User Agent was not availble.
+Written in PHP, this script will generate real User Agent strings with optional capabilities to specify OS, Browser, Mobile, etc. simply by passing a parameter to the function called to generate the User Agent string. Created with the intentions of eliminating footprints while scraping the web for content using cURL because an easy solution to generate a truly random User Agent was not availble.
 
 __Other Randomly Generated Segments__
 * Version of Android with Device / build number strings, and variations of known UA's for specific devices.
@@ -10,12 +10,16 @@ __Other Randomly Generated Segments__
 
 It's also easy to customize with random syntax parsing and random number generating, see `Customizing User Agent` below
 ***
+# Installation 
+For installation with composer run the following command:
+```shell script
+composer require chrisspaghetti/useragentgenerator:dev-master
+```
+***
 # Usage Summary
-1. Require `useragent.php` in the file where the User Agent string will be generated.
-..*```php require_once __DIR__.'/userAgent.php';```
-2. Initialize the `userAgent` class 
+1. Initialize the `userAgent` class 
 ..*```php $agent = new userAgent;```
-3. Call the `generate` function to generate a random User Agent string as many times as needed. 
+2. Call the `generate` function to generate a random User Agent string as many times as needed. 
 ..*```php $UAString = $agent->generate();``` 
 
 ### Example Usage 
@@ -30,7 +34,7 @@ $userAgent = (new userAgent) ->generate();
 ```
 
 ### Example Usage when specifying a single OS, Browser, or Mobile
-You can specify either `firefox`, `chrome`, `mobile`, `windows`, `mac`, `iphone`, `ipad`, `ipod`, and `android`.
+You can specify either `firefox`, `chrome`, `explorer`, `mobile`, `windows`, `mac`, `iphone`, `ipad`, `ipod`, and `android`.
 ```php
 $agent = new userAgent();
 $UAFireFox = $agent->generate('firefox'); // generates a firefox user agent on either windows or mac
diff --git a/composer.json b/composer.json
index 516fae8..86b69b4 100644
--- a/composer.json
+++ b/composer.json
@@ -1,20 +1,29 @@
 {
-    "name": "phpfail/UserAgentGenerator",
-    "description": "Generate a random User Agent for based on OS, Browser, ect.",
-    "type": "library",
-    "version":"1.0.1",
-    "license":"GPL-3.0-only",
-    "authors": [
-        {
-            "name":"phpfail",
-            "email":"phpfail@gihub.com"
-        }
-    ],
-     "autoload": {
-        "psr-4": {
-            "phpfail\\": "./"
-        }
+  "name": "chrisspaghetti/useragentgenerator",
+  "description": "Generate a random User Agent based on OS, platform, browser, etc.",
+  "keywords": [
+    "random",
+    "user agent",
+    "generator"
+  ],
+  "type": "library",
+  "version": "1.0.2",
+  "license": "GPL-3.0-only",
+  "authors": [
+    {
+      "name": "phpfail",
+      "email": "phpfail@gihub.com"
     },
-    "minimum-stability": "dev",
-    "require": {}
+    {
+      "name": "chrisspaghetti",
+      "email": "chrisspaghetti@chrispage.de",
+      "role": "Developer"
+    }
+  ],
+  "require": {
+    "php": ">=7.0"
+  },
+  "autoload": {
+    "files": ["userAgent.php"]
+  }
 }
diff --git a/test.php b/test.php
new file mode 100644
index 0000000..28636a1
--- /dev/null
+++ b/test.php
@@ -0,0 +1,17 @@
+<?php
+require __DIR__ . '/vendor/autoload.php';
+error_reporting(E_ALL);
+
+echo 'RANDOM 100:'."\n";
+for ($i = 1; $i<= 100; $i++) {
+    $agent = new userAgent();
+    echo $agent->generate()."\n";
+}
+
+echo "\n";
+echo 'TESTING NESTED:'."\n";
+for ($i = 1; $i<= 10; $i++) {
+    $example = 'Android [7.[1|0]|6.0|5.1]';
+    $agent = new userAgent();
+    echo $agent->generate($example)."\n";
+}
diff --git a/userAgent.php b/userAgent.php
index 31ea094..d4a1da9 100644
--- a/userAgent.php
+++ b/userAgent.php
@@ -1,46 +1,48 @@
 <?php
+
 /** **********************************************************************************
  * Generate hundreds of thousands of unique mobile & desktop User Agents that are 100% authentic.
  * Supports Hundreds of Android devices, 32 & 64 bit versions of Windows XP-10.5, Linux 540-686, and Mac 7-10.12
  * as well as browsers Firefox, Chrome, and Internet Explorer.
  */
-class userAgent {
+class userAgent
+{
     /**
      * Windows Operating System list with dynamic versioning
      * @var array $windows_os
      */
-    public $windows_os = [ '[Windows; |Windows; U; |]Windows NT 6.:number0-3:;[ Win64; x64| WOW64| x64|]',
-                           '[Windows; |Windows; U; |]Windows NT 10.:number0-5:;[ Win64; x64| WOW64| x64|]', ];
+    public $windows_os = ['[Windows; |Windows; U; |]Windows NT 6.:number0-3:;[ Win64; x64| WOW64| x64|]',
+        '[Windows; |Windows; U; |]Windows NT 10.:number0-5:;[ Win64; x64| WOW64| x64|]',];
     /**
      * Linux Operating Systems [limited]
      * @var array $linux_os
      */
-    public $linux_os = [ '[Linux; |][U; |]Linux x86_64',
-                         '[Linux; |][U; |]Linux i:number5-6::number4-8::number0-6: [x86_64|]' ];
+    public $linux_os = ['[Linux; |][U; |]Linux x86_64',
+        '[Linux; |][U; |]Linux i:number5-6::number4-8::number0-6: [x86_64|]'];
     /**
      * Mac Operating System (OS X) with dynamic versioning
      * @var array $mac_os
      */
-    public $mac_os = [ 'Macintosh; [U; |]Intel Mac OS X :number7-9:_:number0-9:_:number0-9:',
-                       'Macintosh; [U; |]Intel Mac OS X 10_:number0-12:_:number0-9:' ];
+    public $mac_os = ['Macintosh; [U; |]Intel Mac OS X :number7-9:_:number0-9:_:number0-9:',
+        'Macintosh; [U; |]Intel Mac OS X 10_:number0-12:_:number0-9:'];
     /**
      * Versions of Android to be used
      * @var array $androidVersions
      */
-    public $androidVersions = [ '4.3.1',
-                                '4.4',
-                                '4.4.1',
-                                '4.4.4',
-                                '5.0',
-                                '5.0.1',
-                                '5.0.2',
-                                '5.1',
-                                '5.1.1',
-                                '6.0',
-                                '6.0.1',
-                                '7.0',
-                                '7.1',
-                                '7.1.1' ];
+    public $androidVersions = ['4.3.1',
+        '4.4',
+        '4.4.1',
+        '4.4.4',
+        '5.0',
+        '5.0.1',
+        '5.0.2',
+        '5.1',
+        '5.1.1',
+        '6.0',
+        '6.0.1',
+        '7.0',
+        '7.1',
+        '7.1.1'];
     /**
      * Holds the version of android for the User Agent being generated
      * @property string $androidVersion
@@ -50,274 +52,309 @@ class userAgent {
      * Android devices and for specific android versions
      * @var array $androidDevices
      */
-    public $androidDevices = [ '4.3' => [ 'GT-I9:number2-5:00 Build/JDQ39',
-                                          'Nokia 3:number1-3:[10|15] Build/IMM76D',
-                                          '[SAMSUNG |]SM-G3:number1-5:0[R5|I|V|A|T|S] Build/JLS36C',
-                                          'Ascend G3:number0-3:0 Build/JLS36I',
-                                          '[SAMSUNG |]SM-G3:number3-6::number1-8::number0-9:[V|A|T|S|I|R5] Build/JLS36C',
-                                          'HUAWEI G6-L:number10-11: Build/HuaweiG6-L:number10-11:',
-                                          '[SAMSUNG |]SM-[G|N]:number7-9:1:number0-8:[S|A|V|T] Build/[JLS36C|JSS15J]',
-                                          '[SAMSUNG |]SGH-N0:number6-9:5[T|V|A|S] Build/JSS15J',
-                                          'Samsung Galaxy S[4|IV] Mega GT-I:number89-95:00 Build/JDQ39',
-                                          'SAMSUNG SM-T:number24-28:5[s|a|t|v] Build/[JLS36C|JSS15J]',
-                                          'HP :number63-73:5 Notebook PC Build/[JLS36C|JSS15J]',
-                                          'HP Compaq 2:number1-3:10b Build/[JLS36C|JSS15J]',
-                                          'HTC One 801[s|e] Build/[JLS36C|JSS15J]',
-                                          'HTC One max Build/[JLS36C|JSS15J]',
-                                          'HTC Xplorer A:number28-34:0[e|s] Build/GRJ90', ],
-                               '4.4' => [ 'XT10:number5-8:0 Build/SU6-7.3',
-                                          'XT10:number12-52: Build/[KXB20.9|KXC21.5]',
-                                          'Nokia :number30-34:10 Build/IMM76D',
-                                          'E:number:20-23::number0-3::number0-4: Build/24.0.[A|B].1.34',
-                                          '[SAMSUNG |]SM-E500[F|L] Build/KTU84P',
-                                          'LG Optimus G Build/KRT16M',
-                                          'LG-E98:number7-9: Build/KOT49I',
-                                          'Elephone P:number2-6:000 Build/KTU84P',
-                                          'IQ450:number0-4: Quad Build/KOT49H',
-                                          'LG-F:number2-5:00[K|S|L] Build/KOT49[I|H]',
-                                          'LG-V:number3-7::number0-1:0 Build/KOT49I',
-                                          '[SAMSUNG |]SM-J:number1-2::number0-1:0[G|F] Build/KTU84P',
-                                          '[SAMSUNG |]SM-N80:number0-1:0 Build/[KVT49L|JZO54K]',
-                                          '[SAMSUNG |]SM-N900:number5-8: Build/KOT49H',
-                                          '[SAMSUNG-|]SGH-I337[|M] Build/[JSS15J|KOT49H]',
-                                          '[SAMSUNG |]SM-G900[W8|9D|FD|H|V|FG|A|T] Build/KOT49H',
-                                          '[SAMSUNG |]SM-T5:number30-35: Build/[KOT49H|KTU84P]',
-                                          '[Google |]Nexus :number5-7: Build/KOT49H',
-                                          'LG-H2:number0-2:0 Build/KOT49[I|H]',
-                                          'HTC One[_M8|_M9|0P6B|801e|809d|0P8B2|mini 2|S][ dual sim|] Build/[KOT49H|KTU84L]',
-                                          '[SAMSUNG |]GT-I9:number3-5:0:number0-6:[V|I|T|N] Build/KOT49H',
-                                          'Lenovo P7:number7-8::number1-6: Build/[Lenovo|JRO03C]',
-                                          'LG-D95:number1-8: Build/KOT49[I|H]',
-                                          'LG-D:number1-8::number0-8:0 Build/KOT49[I|H]',
-                                          'Nexus5 V:number6-7:.1 Build/KOT49H',
-                                          'Nexus[_|] :number4-10: Build/[KOT49H|KTU84P]',
-                                          'Nexus[_S_| S ][4G |]Build/GRJ22',
-                                          '[HM NOTE|NOTE-III|NOTE2 1LTE[TD|W|T]',
-                                          'ALCATEL ONE[| ]TOUCH 70:number2-4::number0-9:[X|D|E|A] Build/KOT49H',
-                                          'MOTOROLA [MOTOG|MSM8960|RAZR] Build/KVT49L' ],
-                               '5.0' => [ 'Nokia :number10-11:00 [wifi|4G|LTE] Build/GRK39F',
-                                          'HTC 80:number1-2[s|w|e|t] Build/[LRX22G|JSS15J]',
-                                          'Lenovo A7000-a Build/LRX21M;',
-                                          'HTC Butterfly S [901|919][s|d|] Build/LRX22G',
-                                          'HTC [M8|M9|M8 Pro Build/LRX22G',
-                                          'LG-D3:number25-37: Build/LRX22G',
-                                          'LG-D72:number0-9: Build/LRX22G',
-                                          '[SAMSUNG |]SM-G4:number0-9:0 Build/LRX22[G|C]',
-                                          '[|SAMSUNG ]SM-G9[00|25|20][FD|8|F|F-ORANGE|FG|FQ|H|I|L|M|S|T] Build/[LRX21T|KTU84F|KOT49H]',
-                                          '[SAMSUNG |]SM-A:number7-8:00[F|I|T|H|] Build/[LRX22G|LMY47X]',
-                                          '[SAMSUNG-|]SM-N91[0|5][A|V|F|G|FY] Build/LRX22C',
-                                          '[SAMSUNG |]SM-[T|P][350|550|555|355|805|800|710|810|815] Build/LRX22G',
-                                          'LG-D7:number0-2::number0-9: Build/LRX22G',
-                                          '[LG|SM]-[D|G]:number8-9::number0-5::number0-9:[|P|K|T|I|F|T1] Build/[LRX22G|KOT49I|KVT49L|LMY47X]' ],
-                               '5.1' => [ 'Nexus :number5-9: Build/[LMY48B|LRX22C]',
-                                          '[|SAMSUNG ]SM-G9[28|25|20][X|FD|8|F|F-ORANGE|FG|FQ|H|I|L|M|S|T] Build/[LRX22G|LMY47X]',
-                                          '[|SAMSUNG ]SM-G9[35|350][X|FD|8|F|F-ORANGE|FG|FQ|H|I|L|M|S|T] Build/[MMB29M|LMY47X]',
-                                          '[MOTOROLA |][MOTO G|MOTO G XT1068|XT1021|MOTO E XT1021|MOTO XT1580|MOTO X FORCE XT1580|MOTO X PLAY XT1562|MOTO XT1562|MOTO XT1575|MOTO X PURE XT1575|MOTO XT1570 MOTO X STYLE] Build/[LXB22|LMY47Z|LPC23|LPK23|LPD23|LPH223]' ],
-                               '6.0' => [ '[SAMSUNG |]SM-[G|D][920|925|928|9350][V|F|I|L|M|S|8|I] Build/[MMB29K|MMB29V|MDB08I|MDB08L]',
-                                          'Nexus :number5-7:[P|X|] Build/[MMB29K|MMB29V|MDB08I|MDB08L]',
-                                          'HTC One[_| ][M9|M8|M8 Pro] Build/MRA58K',
-                                          'HTC One[_M8|_M9|0P6B|801e|809d|0P8B2|mini 2|S][ dual sim|] Build/MRA58K' ],
-                               '7.0' => [ 'Pixel [XL|C] Build/[NRD90M|NME91E]',
-                                          'Nexus :number5-9:[X|P|] Build/[NPD90G|NME91E]',
-                                          '[SAMSUNG |]GT-I:number91-98:00 Build/KTU84P',
-                                          'Xperia [V |]Build/NDE63X',
-                                          'LG-H:number90-93:0 Build/NRD90[C|M]' ],
-                               '7.1' => [ 'Pixel [XL|C] Build/[NRD90M|NME91E]',
-                                          'Nexus :number5-9:[X|P|] Build/[NPD90G|NME91E]',
-                                          '[SAMSUNG |]GT-I:number91-98:00 Build/KTU84P',
-                                          'Xperia [V |]Build/NDE63X',
-                                          'LG-H:number90-93:0 Build/NRD90[C|M]' ] ];
+    public $androidDevices = ['4.3' => ['GT-I9:number2-5:00 Build/JDQ39',
+        'Nokia 3:number1-3:[10|15] Build/IMM76D',
+        '[SAMSUNG |]SM-G3:number1-5:0[R5|I|V|A|T|S] Build/JLS36C',
+        'Ascend G3:number0-3:0 Build/JLS36I',
+        '[SAMSUNG |]SM-G3:number3-6::number1-8::number0-9:[V|A|T|S|I|R5] Build/JLS36C',
+        'HUAWEI G6-L:number10-11: Build/HuaweiG6-L:number10-11:',
+        '[SAMSUNG |]SM-[G|N]:number7-9:1:number0-8:[S|A|V|T] Build/[JLS36C|JSS15J]',
+        '[SAMSUNG |]SGH-N0:number6-9:5[T|V|A|S] Build/JSS15J',
+        'Samsung Galaxy S[4|IV] Mega GT-I:number89-95:00 Build/JDQ39',
+        'SAMSUNG SM-T:number24-28:5[s|a|t|v] Build/[JLS36C|JSS15J]',
+        'HP :number63-73:5 Notebook PC Build/[JLS36C|JSS15J]',
+        'HP Compaq 2:number1-3:10b Build/[JLS36C|JSS15J]',
+        'HTC One 801[s|e] Build/[JLS36C|JSS15J]',
+        'HTC One max Build/[JLS36C|JSS15J]',
+        'HTC Xplorer A:number28-34:0[e|s] Build/GRJ90',],
+        '4.4' => ['XT10:number5-8:0 Build/SU6-7.3',
+            'XT10:number12-52: Build/[KXB20.9|KXC21.5]',
+            'Nokia :number30-34:10 Build/IMM76D',
+            'E:number:20-23::number0-3::number0-4: Build/24.0.[A|B].1.34',
+            '[SAMSUNG |]SM-E500[F|L] Build/KTU84P',
+            'LG Optimus G Build/KRT16M',
+            'LG-E98:number7-9: Build/KOT49I',
+            'Elephone P:number2-6:000 Build/KTU84P',
+            'IQ450:number0-4: Quad Build/KOT49H',
+            'LG-F:number2-5:00[K|S|L] Build/KOT49[I|H]',
+            'LG-V:number3-7::number0-1:0 Build/KOT49I',
+            '[SAMSUNG |]SM-J:number1-2::number0-1:0[G|F] Build/KTU84P',
+            '[SAMSUNG |]SM-N80:number0-1:0 Build/[KVT49L|JZO54K]',
+            '[SAMSUNG |]SM-N900:number5-8: Build/KOT49H',
+            '[SAMSUNG-|]SGH-I337[|M] Build/[JSS15J|KOT49H]',
+            '[SAMSUNG |]SM-G900[W8|9D|FD|H|V|FG|A|T] Build/KOT49H',
+            '[SAMSUNG |]SM-T5:number30-35: Build/[KOT49H|KTU84P]',
+            '[Google |]Nexus :number5-7: Build/KOT49H',
+            'LG-H2:number0-2:0 Build/KOT49[I|H]',
+            'HTC One[_M8|_M9|0P6B|801e|809d|0P8B2|mini 2|S][ dual sim|] Build/[KOT49H|KTU84L]',
+            '[SAMSUNG |]GT-I9:number3-5:0:number0-6:[V|I|T|N] Build/KOT49H',
+            'Lenovo P7:number7-8::number1-6: Build/[Lenovo|JRO03C]',
+            'LG-D95:number1-8: Build/KOT49[I|H]',
+            'LG-D:number1-8::number0-8:0 Build/KOT49[I|H]',
+            'Nexus5 V:number6-7:.1 Build/KOT49H',
+            'Nexus[_|] :number4-10: Build/[KOT49H|KTU84P]',
+            'Nexus[_S_| S ][4G |]Build/GRJ22',
+            '[HM NOTE|NOTE-III|NOTE2 1LTE[TD|W|T]',
+            'ALCATEL ONE[| ]TOUCH 70:number2-4::number0-9:[X|D|E|A] Build/KOT49H',
+            'MOTOROLA [MOTOG|MSM8960|RAZR] Build/KVT49L'],
+        '5.0' => ['Nokia :number10-11:00 [wifi|4G|LTE] Build/GRK39F',
+            'HTC 80:number1-2[s|w|e|t] Build/[LRX22G|JSS15J]',
+            'Lenovo A7000-a Build/LRX21M;',
+            'HTC Butterfly S [901|919][s|d|] Build/LRX22G',
+            'HTC [M8|M9|M8 Pro Build/LRX22G',
+            'LG-D3:number25-37: Build/LRX22G',
+            'LG-D72:number0-9: Build/LRX22G',
+            '[SAMSUNG |]SM-G4:number0-9:0 Build/LRX22[G|C]',
+            '[|SAMSUNG ]SM-G9[00|25|20][FD|8|F|F-ORANGE|FG|FQ|H|I|L|M|S|T] Build/[LRX21T|KTU84F|KOT49H]',
+            '[SAMSUNG |]SM-A:number7-8:00[F|I|T|H|] Build/[LRX22G|LMY47X]',
+            '[SAMSUNG-|]SM-N91[0|5][A|V|F|G|FY] Build/LRX22C',
+            '[SAMSUNG |]SM-[T|P][350|550|555|355|805|800|710|810|815] Build/LRX22G',
+            'LG-D7:number0-2::number0-9: Build/LRX22G',
+            '[LG|SM]-[D|G]:number8-9::number0-5::number0-9:[|P|K|T|I|F|T1] Build/[LRX22G|KOT49I|KVT49L|LMY47X]'],
+        '5.1' => ['Nexus :number5-9: Build/[LMY48B|LRX22C]',
+            '[|SAMSUNG ]SM-G9[28|25|20][X|FD|8|F|F-ORANGE|FG|FQ|H|I|L|M|S|T] Build/[LRX22G|LMY47X]',
+            '[|SAMSUNG ]SM-G9[35|350][X|FD|8|F|F-ORANGE|FG|FQ|H|I|L|M|S|T] Build/[MMB29M|LMY47X]',
+            '[MOTOROLA |][MOTO G|MOTO G XT1068|XT1021|MOTO E XT1021|MOTO XT1580|MOTO X FORCE XT1580|MOTO X PLAY XT1562|MOTO XT1562|MOTO XT1575|MOTO X PURE XT1575|MOTO XT1570 MOTO X STYLE] Build/[LXB22|LMY47Z|LPC23|LPK23|LPD23|LPH223]'],
+        '6.0' => ['[SAMSUNG |]SM-[G|D][920|925|928|9350][V|F|I|L|M|S|8|I] Build/[MMB29K|MMB29V|MDB08I|MDB08L]',
+            'Nexus :number5-7:[P|X|] Build/[MMB29K|MMB29V|MDB08I|MDB08L]',
+            'HTC One[_| ][M9|M8|M8 Pro] Build/MRA58K',
+            'HTC One[_M8|_M9|0P6B|801e|809d|0P8B2|mini 2|S][ dual sim|] Build/MRA58K'],
+        '7.0' => ['Pixel [XL|C] Build/[NRD90M|NME91E]',
+            'Nexus :number5-9:[X|P|] Build/[NPD90G|NME91E]',
+            '[SAMSUNG |]GT-I:number91-98:00 Build/KTU84P',
+            'Xperia [V |]Build/NDE63X',
+            'LG-H:number90-93:0 Build/NRD90[C|M]'],
+        '7.1' => ['Pixel [XL|C] Build/[NRD90M|NME91E]',
+            'Nexus :number5-9:[X|P|] Build/[NPD90G|NME91E]',
+            '[SAMSUNG |]GT-I:number91-98:00 Build/KTU84P',
+            'Xperia [V |]Build/NDE63X',
+            'LG-H:number90-93:0 Build/NRD90[C|M]']];
     /**
      * List of "OS" strings used for android
      * @var array $android_os
      */
-    public $android_os = [ 'Linux; Android :androidVersion:; :androidDevice:',
-                           //TODO: Add a $windowsDevices variable that does the same as androidDevice
-                           //'Windows Phone 10.0; Android :androidVersion:; :windowsDevice:',
-                           'Linux; U; Android :androidVersion:; :androidDevice:',
-                           'Android; Android :androidVersion:; :androidDevice:', ];
+    public $android_os = ['Linux; Android :androidVersion:; :androidDevice:',
+        //TODO: Add a $windowsDevices variable that does the same as androidDevice
+        //'Windows Phone 10.0; Android :androidVersion:; :windowsDevice:',
+        'Linux; U; Android :androidVersion:; :androidDevice:',
+        'Android; Android :androidVersion:; :androidDevice:',];
     /**
      * List of "OS" strings used for iOS
      * @var array $mobile_ios
      */
-    public $mobile_ios = [ 'iphone' => 'iPhone; CPU iPhone OS :number7-11:_:number0-9:_:number0-9:; like Mac OS X;',
-                           'ipad' => 'iPad; CPU iPad OS :number7-11:_:number0-9:_:number0-9: like Mac OS X;',
-                           'ipod' => 'iPod; CPU iPod OS :number7-11:_:number0-9:_:number0-9:; like Mac OS X;', ];
-    
+    public $mobile_ios = ['iphone' => 'iPhone; CPU iPhone OS :number7-11:_:number0-9:_:number0-9:; like Mac OS X;',
+        'ipad' => 'iPad; CPU iPad OS :number7-11:_:number0-9:_:number0-9: like Mac OS X;',
+        'ipod' => 'iPod; CPU iPod OS :number7-11:_:number0-9:_:number0-9:; like Mac OS X;',];
+
     /**
      * Get a random operating system
      * @param null|string $os
      * @return string *
+     * @throws Exception
      */
-    public function getOS($os = NULL) {
+    public function getOS($os = NULL)
+    {
         $_os = [];
-        if($os === NULL || in_array($os, [ 'chrome', 'firefox', 'explorer' ])) {
+        if ($os === NULL || in_array($os, ['chrome', 'firefox', 'explorer'])) {
             $_os = $os === 'explorer' ? $this->windows_os : array_merge($this->windows_os, $this->linux_os, $this->mac_os);
         } else {
             $_os += $this->{$os . '_os'};
         }
         // randomly select on operating system
         $selected_os = rtrim($_os[random_int(0, count($_os) - 1)], ';');
-        
+
         // check for spin syntax
-        if(strpos($selected_os, '[') !== FALSE) {
+        if (strpos($selected_os, '[') !== FALSE) {
             $selected_os = self::processSpinSyntax($selected_os);
         }
-        
+
         // check for random number syntax
-        if(strpos($selected_os, ':number') !== FALSE) {
+        if (strpos($selected_os, ':number') !== FALSE) {
             $selected_os = self::processRandomNumbers($selected_os);
         }
-        
-        if(random_int(1, 100) > 50) {
+
+        if (random_int(1, 100) > 50) {
             $selected_os .= '; en-US';
         }
         return $selected_os;
     }
-    
+
     /**
      * Get Mobile OS
      * @param null|string $os Can specifiy android, iphone, ipad, ipod, or null/blank for random
-     * @return string *
+     * @return string
+     * @throws Exception
      */
-    public function getMobileOS($os = NULL) {
+    public function getMobileOS($os = NULL)
+    {
         $os = strtolower($os);
         $_os = [];
-        switch( $os ) {
+        switch ($os) {
             case'android':
                 $_os += $this->android_os;
-            break;
+                break;
             case 'iphone':
             case 'ipad':
             case 'ipod':
                 $_os[] = $this->mobile_ios[$os];
-            break;
+                break;
             default:
                 $_os = array_merge($this->android_os, array_values($this->mobile_ios));
         }
         // select random mobile os
         $selected_os = rtrim($_os[random_int(0, count($_os) - 1)], ';');
-        if(strpos($selected_os, ':androidVersion:') !== FALSE) {
+        if (strpos($selected_os, ':androidVersion:') !== FALSE) {
             $selected_os = $this->processAndroidVersion($selected_os);
         }
-        if(strpos($selected_os, ':androidDevice:') !== FALSE) {
+        if (strpos($selected_os, ':androidDevice:') !== FALSE) {
             $selected_os = $this->addAndroidDevice($selected_os);
         }
-        if(strpos($selected_os, ':number') !== FALSE) {
+        if (strpos($selected_os, ':number') !== FALSE) {
             $selected_os = self::processRandomNumbers($selected_os);
         }
         return $selected_os;
     }
-    
+
     /**
      *  static::processRandomNumbers
      * @param $selected_os
-     * @return null|string|string[] *
+     * @return null|string|string[]
+     * @throws Exception
      */
-    public static function processRandomNumbers($selected_os) {
-        return preg_replace_callback('/:number(\d+)-(\d+):/i', function($matches) { return random_int($matches[1], $matches[2]); }, $selected_os);
+    public static function processRandomNumbers($selected_os)
+    {
+        return preg_replace_callback('/:number(\d+)-(\d+):/i', function ($matches) {
+            return random_int($matches[1], $matches[2]);
+        }, $selected_os);
     }
-    
+
     /**
      *  static::processSpinSyntax
      * @param $selected_os
      * @return null|string|string[] *
      */
-    public static function processSpinSyntax($selected_os) {
-        return preg_replace_callback('/\[([\w\-\s|;]*?)\]/i', function($matches) {
+    public static function processSpinSyntax($selected_os)
+    {
+        return preg_replace_callback('/\[([\w\-\s|;]*?)]/i', function ($matches) {
             $shuffle = explode('|', $matches[1]);
             return $shuffle[array_rand($shuffle)];
         }, $selected_os);
     }
-    
+
     /**
      * processAndroidVersion
      * @param $selected_os
      * @return null|string|string[] *
      */
-    public function processAndroidVersion($selected_os) {
+    public function processAndroidVersion($selected_os)
+    {
         $this->androidVersion = $version = $this->androidVersions[array_rand($this->androidVersions)];
-        return preg_replace_callback('/:androidVersion:/i', function($matches) use ($version) { return $version; }, $selected_os);
+        return preg_replace_callback('/:androidVersion:/i', function () use ($version) {
+            return $version;
+        }, $selected_os);
     }
-    
+
     /**
      * addAndroidDevice
      * @param $selected_os
      * @return null|string|string[] *
      */
-    public function addAndroidDevice($selected_os) {
+    public function addAndroidDevice($selected_os)
+    {
         $devices = $this->androidDevices[substr($this->androidVersion, 0, 3)];
-        $device  = $devices[array_rand($devices)];
-        
+        $device = $devices[array_rand($devices)];
+
         $device = self::processSpinSyntax($device);
-        return preg_replace_callback('/:androidDevice:/i', function($matches) use ($device) { return $device; }, $selected_os);
+        return preg_replace_callback('/:androidDevice:/i', function () use ($device) {
+            return $device;
+        }, $selected_os);
     }
-    
+
     /**
      *  static::chromeVersion
      * @param $version
      * @return string *
+     * @throws Exception
      */
-    public static function chromeVersion($version) {
+    public static function chromeVersion($version)
+    {
         return random_int($version['min'], $version['max']) . '.0.' . random_int(1000, 4000) . '.' . random_int(100, 400);
     }
-    
+
     /**
      *  static::firefoxVersion
      * @param $version
      * @return string *
+     * @throws Exception
      */
-    public static function firefoxVersion($version) {
+    public static function firefoxVersion($version)
+    {
         return random_int($version['min'], $version['max']) . '.' . random_int(0, 9);
     }
-    
-    /**
-     *  static::windows
-     * @param $version
-     * @return string *
-     */
-    public static function windows($version) {
-        return random_int($version['min'], $version['max']) . '.' . random_int(0, 9);
-    }
-    
+
     /**
      * generate
-     * @param null $userAgent
-     * @return string *
+     *
+     * @param mixed $userAgent You can specify either firefox, chrome, explorer, mobile, windows, mac, iphone, ipad, ipod or android.
+     * @return string the generated user agent string
+     * @throws Exception
      */
-    public function generate($userAgent = NULL) {
-        if($userAgent === NULL) {
+    public function generate($userAgent = NULL)
+    {
+        if ($userAgent === NULL) {
             $r = random_int(0, 100);
-            if($r >= 44) {
-                $userAgent = array_rand([ 'firefox' => 1, 'chrome' => 1, 'explorer' => 1 ]);
+            if ($r >= 44) {
+                $browsers = ['firefox', 'chrome', 'explorer'];
+                $userAgent = $browsers[array_rand($browsers)];
             } else {
-                $userAgent = array_rand([ 'iphone' => 1, 'android' => 1, 'mobile' => 1 ]);
+                $platform = ['iphone', 'android', 'mobile'];
+                $userAgent = $platform[array_rand($platform)];
             }
-        } elseif($userAgent == 'windows' || $userAgent == 'mac' || $userAgent == 'linux') {
-            $agents = [ 'firefox' => 1, 'chrome' => 1 ];
-            if($userAgent == 'windows') {
-                $agents['explorer'] = 1;
+        } else {
+            $userAgent = strtolower($userAgent);
+
+            if ($userAgent == 'windows' || $userAgent == 'mac' || $userAgent == 'linux') {
+                $browsers = ['firefox', 'chrome'];
+
+                if ($userAgent == 'windows') {
+                    $browsers[] = 'explorer';
+                }
+
+                $userAgent = $browsers[array_rand($browsers)];
             }
-            $userAgent = array_rand($agents);
         }
-        $_SESSION['agent'] = $userAgent;
-        if($userAgent == 'chrome') {
-            return 'Mozilla/5.0 (' . $this->getOS($userAgent) . ') AppleWebKit/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603)) . '.' . random_int(1, 50) . ' (KHTML, like Gecko) Chrome/' . self::chromeVersion([ 'min' => 47,
-                                                                                                                                                                                                                                              'max' => 55 ]) . ' Safari/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603));
-        } elseif($userAgent == 'firefox') {
-            
-            return 'Mozilla/5.0 (' . $this->getOS($userAgent) . ') Gecko/' . (random_int(1, 100) > 30 ? '20100101' : '20130401') . ' Firefox/' . self::firefoxVersion([ 'min' => 45,
-                                                                                                                                                                        'max' => 74 ]);
-        } elseif($userAgent == 'explorer') {
-            
-            return 'Mozilla / 5.0 (compatible; MSIE ' . ($int = random_int(7, 11)) . '.0; ' . $this->getOS('windows') . ' Trident / ' . ($int == 7 || $int == 8 ? '4' : ($int == 9 ? '5' : ($int == 10 ? '6' : '7'))) . '.0)';
-        } elseif($userAgent == 'mobile' || $userAgent == 'android' || $userAgent == 'iphone' || $userAgent == 'ipad' || $userAgent == 'ipod') {
-            
-            return 'Mozilla/5.0 (' . $this->getMobileOS($userAgent) . ') AppleWebKit/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603)) . '.' . random_int(1, 50) . ' (KHTML, like Gecko)  Chrome/' . self::chromeVersion([ 'min' => 47,
-                                                                                                                                                                                                                                                     'max' => 55 ]) . ' Mobile Safari/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603)) . '.' . random_int(0, 9);
-        } else {
-            new Exception('Unable to determine user agent to generate');
+
+        // generate user agent string
+        try {
+            switch ($userAgent) {
+                case 'chrome':
+                    $result = 'Mozilla/5.0 (' . $this->getOS($userAgent) . ') AppleWebKit/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603)) . '.' . random_int(1, 50) . ' (KHTML, like Gecko) Chrome/' . self::chromeVersion(['min' => 47,
+                            'max' => 55]) . ' Safari/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603));
+                    break;
+                case 'firefox':
+                    $result = 'Mozilla/5.0 (' . $this->getOS($userAgent) . ') Gecko/' . (random_int(1, 100) > 30 ? '20100101' : '20130401') . ' Firefox/' . self::firefoxVersion(['min' => 45,
+                            'max' => 74]);
+                    break;
+                case 'explorer':
+                    $result = 'Mozilla/5.0 (compatible; MSIE ' . ($int = random_int(7, 11)) . '.0; ' . $this->getOS('windows') . ' Trident / ' . ($int == 7 || $int == 8 ? '4' : ($int == 9 ? '5' : ($int == 10 ? '6' : '7'))) . '.0)';
+                    break;
+                case 'mobile'
+                    or 'android'
+                    or 'iphone'
+                    or 'ipad'
+                    or 'ipod':
+                    $result = 'Mozilla/5.0 (' . $this->getMobileOS($userAgent) . ') AppleWebKit/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603)) . '.' . random_int(1, 50) . ' (KHTML, like Gecko) Chrome/' . self::chromeVersion(['min' => 47,
+                            'max' => 55]) . ' Mobile Safari/' . (random_int(1, 100) > 50 ? random_int(533, 537) : random_int(600, 603)) . '.' . random_int(0, 9);
+                    break;
+
+                default:
+                    throw new Exception('unknown platform "'.$userAgent.'"');
+            }
+        } catch (Exception $e) {
+            throw new Exception('Unable to determine user agent: ' . $e->getMessage());
         }
+
+        return $result;
     }
 }