PHP: Update CloudFront signing URL examples to a supported API version (#5435)

Update CloudFront signing URL examples to a supported API version

Author: wsamoht

php/example_code/cloudfront/SignCookie.php

@@ -62,7 +62,7 @@ function signACookie()
 
     $cloudFrontClient = new CloudFrontClient([
         'profile' => 'default',
-        'version' => '2014-11-06',
+        'version' => '2018-06-18',
         'region' => 'us-east-1'
     ]);
 

php/example_code/cloudfront/SignCookiePolicy.php

@@ -73,7 +73,7 @@ function signACookiePolicy()
 
     $cloudFrontClient = new CloudFrontClient([
         'profile' => 'default',
-        'version' => '2014-11-06',
+        'version' => '2018-06-18',
         'region' => 'us-east-1'
     ]);
 

php/example_code/cloudfront/SignPrivateDistribution.php

@@ -61,7 +61,7 @@ function signAPrivateDistribution()
 
     $cloudFrontClient = new CloudFrontClient([
         'profile' => 'default',
-        'version' => '2014-11-06',
+        'version' => '2018-06-18',
         'region' => 'us-east-1'
     ]);
 

php/example_code/cloudfront/SignPrivateDistributionPolicy.php

@@ -74,7 +74,7 @@ function signAPrivateDistributionPolicy()
 
     $cloudFrontClient = new CloudFrontClient([
         'profile' => 'default',
-        'version' => '2014-11-06',
+        'version' => '2018-06-18',
         'region' => 'us-east-1'
     ]);