Update index.md to add a new item into php array (#31333)

guide/english/php/array/index.md

@@ -84,6 +84,33 @@ Would produce the following output:
 I like Yamaha
 ```
 
+## Add Item
+
+Is possible to add any item to an existing array.
+
+An example of addition can be seen below:
+
+```
+<?php
+
+$bikes = array('Suzuki', 'BMW');
+
+$bikes[] = 'Yamaha';
+```
+
+Another example, using named keys can be seen below:
+
+```
+<?php
+
+$bikes = [
+    'favorite'        => 'Suzuki',
+    'second favorite' => 'BMW'
+];
+
+$bikes['not my favorite'] = 'Yamaha';
+```
+
 ## Multidimensional Array
 
 As we mentioned earlier arrays are collection of items, often times these items may be arrays of themselves. 
@@ -92,7 +119,6 @@ As we mentioned earlier arrays are collection of items, often times these items
 You will always be able to get the value for the specific key by going down the layers: $arr['layerOne']['two']
 
 
-
 ## Pitfalls
 
 When working with arrays, there are a few important things to keep in mind: