Fix PHP_CodeSniffer coding standard errors (#993)

* Fix PHP_CodeSniffer errors

Error message:
Header blocks must be separated by a single blank line (PSR12.Files.FileHeader.SpacingAfterTagBlock)

* Fix PHP_CodeSniffer errors

Error message:
Opening brace should be on a new line (Squiz.Functions.MultiLineFunctionDeclaration.BraceOnSameLine)

* Fix PHP_CodeSniffer warnings

Error message:
A file should declare new symbols (classes, functions, constants, etc.)
and cause no other side effects, or it should execute logic with side
effects, but should not do both. The first symbol is defined on line 6
and the first side effect is on line 14.
(PSR1.Files.SideEffects.FoundWithSymbols)

examples/post_multiple_values_same_key_without_indexes.php

@@ -1,4 +1,5 @@
 <?php
+
 // keywords:
 //   Django: MultiValueDict, QueryDict, request.GET.getlist(), request.POST.getlist()
 //   Python: urllib.urlencode, parse.urlencode

examples/put_large_file_chunked.php

@@ -1,4 +1,5 @@
 <?php
+
 // PUT a file using chunked data.
 // See also "examples/receive_large_file_chunked.php".
 

examples/receive_large_file_chunked.php

@@ -1,4 +1,5 @@
 <?php
+
 // Receive PUT file.
 // See also "examples/put_large_file_chunked.php".
 

tests/ruleset.xml

@@ -13,6 +13,13 @@
 
         <!-- TODO: Remove the following exclusion when ArrayUtil functions not in camel caps format like ArrayUtil::is_array_assoc() are removed. -->
         <exclude name="PSR1.Methods.CamelCapsMethodName.NotCamelCaps" />
+
+        <exclude name="Squiz.Functions.MultiLineFunctionDeclaration.BraceOnSameLine" />
+    </rule>
+
+    <!-- Allow side effects and symbols within files in the examples directory. -->
+    <rule ref="PSR1.Files.SideEffects.FoundWithSymbols">
+        <exclude-pattern>./examples/*</exclude-pattern>
     </rule>
 
     <!-- Prohibit long lines in php files. -->