fix(guide): simplify directory structure

guide/english/php/array/index.md

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+---
+title: array
+---
+
+## Introduction to PHP Array
+
+An array can be thought of as a collection of items.
+
+## Syntax
+
+An array is defined by array(), or [].
+
+An example of an array in each style can be seen below:
+
+```
+<?php
+
+$bikes = array('Suzuki','BMW','Yamaha');
+```
+```
+<?php
+
+$bikes = ['Suzuki', 'BMW', 'Yamaha'];
+```
+
+## Key => Value
+
+Arrays can also be defined with named keys, as shown below:
+
+```
+<?php
+
+$bikes = [
+    'favorite'        => 'Suzuki',
+    'second favorite' => 'BMW',
+    'not my favorite' => 'Yamaha'
+];
+```
+
+## Accessing Items
+
+Items within an array can be accessed by their corresponding key, or location within the array.
+
+For instance:
+
+```
+<?php
+
+$bikes = ['Suzuki', 'BMW', 'Yamaha'];
+
+echo 'I like '. $bikes[0]
+```
+
+Would produce the following output:
+
+```
+I like Suzuki
+```
+
+Another example, using named keys can be seen below:
+```
+<?php
+
+$bikes = [
+    'favorite'        => 'Suzuki',
+    'second favorite' => 'BMW',
+    'not my favorite' => 'Yamaha'
+];
+
+echo 'I like '. $bikes['not my favorite']
+```
+
+Would produce the following output:
+
+```
+I like BWM
+```
+
+## Pitfalls
+
+When working with arrays, there are a few important things to keep in mind:
+
+1) A comma after the last element is optional.
+2) Named keys must be escaped to be accessed (i.e. $bikes[not my favorite] would not work).
+
+For more information, please see [PHP: Arrays](http://php.net/manual/en/language.types.array.php)