array-unique.xml Remove trailing whitespace, CS examples by the way

reference/array/functions/array-unique.xml

@@ -25,7 +25,7 @@
   <note>
    <simpara>
     Two elements are considered equal if and only if
-    <literal>(string) $elem1 === (string) $elem2</literal>, i.e. 
+    <literal>(string) $elem1 === (string) $elem2</literal>, i.e.
     when the string representation is the same, the first element will be used.
    </simpara>
   </note>
@@ -119,9 +119,11 @@
     <programlisting role="php">
 <![CDATA[
 <?php
-$input = array("a" => "green", "red", "b" => "green", "blue", "red");
+
+$input = ["a" => "green", "red", "b" => "green", "blue", "red"];
 $result = array_unique($input);
 print_r($result);
+
 ?>
 ]]>
     </programlisting>
@@ -144,9 +146,11 @@ Array
     <programlisting role="php">
 <![CDATA[
 <?php
-$input = array(4, "4", "3", 4, 3, "3");
+
+$input = [4, "4", "3", 4, 3, "3"];
 $result = array_unique($input);
 var_dump($result);
+
 ?>
 ]]>
     </programlisting>