create script for fetching disposable email providers

Author: daveearley

README.md

@@ -177,3 +177,12 @@ class CustomEmailDataProvider implements EmailDataProviderInterface
 
 ### Is this validation accurate?
 No, none of these tests are 100% accurate. As with any email validation there will always be false positives & negatives. The only way to guarantee an email is valid is to send an email and solicit a response. However, this library is still useful for detecting disposable emails etc., and also acts as a good first line of defence.
+
+### Can I manually update the disposable email provider data?
+Yes, this project relies on [this great]( https://github.com/ivolo/disposable-email-domains) repository for its list of disposable email providers. To fetch the latest list from that repo you can run
+
+```shell
+./scripts/update-dispsable-email-providers.php
+```
+
+from the command line. This will fetch the data and save it to *./src/data/disposable-email-providers.php*

scripts/update-disposable-email-providers.php

@@ -0,0 +1,40 @@
+#!/usr/bin/env php
+
+<?php
+
+/*
+ * To update disposable email providers from the command line run:
+ * $ ./update-disposable-email-providers.php
+ */
+
+$disposableEmailProvidersLocation = 'https://raw.githubusercontent.com/ivolo/disposable-email-domains/master/index.json';
+
+$disposableEmailProvidersJson = file_get_contents($disposableEmailProvidersLocation);
+
+if (!is_string($disposableEmailProvidersJson)) { die('Failed to fetch providers'); }
+
+$disposableEmailProviders = json_decode($disposableEmailProvidersJson, true);
+
+if (!is_array($disposableEmailProviders)) { die('Unable to decode JSON'); }
+
+$exportedArray = var_export($disposableEmailProviders, true);
+
+$phpFileTemplate = <<<TEMPLATE
+<?php
+
+/**
+ * This data is autogenerated. 
+ *
+ * @see https://github.com/ivolo/disposable-email-domains
+ */
+ 
+ return {$exportedArray};
+ 
+TEMPLATE;
+
+$writeToFile = file_put_contents('../src/data/disposable-email-providers.php', $phpFileTemplate);
+
+if (!$writeToFile) { die('Failed to write to file'); }
+
+echo "Successfully Fetched Disposable Email Providers";
+exit();