fix(guide): simplify directory structure

guide/english/php/loops/for-loop/index.md

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+---
+title: For Loop
+---
+
+## For Loop
+
+The PHP  `for` statement consists of three expressions and a statement:
+
+`for ((initialization); (condition); (final-expression)) statement`
+
+### Description
+
+- initialization
+    - Run before the first execution on the loop.
+    - This expression is commonly used to create counters. 
+    - Variables created here are scoped to the loop. Once the loop has finished it is execution they are destroyed.
+- condition 
+    - Expression that is checked prior to the execution of every iteration. 
+    - If omitted this expression evaluates to `true`.
+- final-expression 
+    - Expression that is run after every iteration. 
+    - Usually used to increment a counter. 
+    - But it can be used to run any expression.
+- statement
+    - Code to be repeated in every loop iteration.
+
+Any of these three expressions or the statement can be ommited. 
+
+The expressions can contain multiple expressions separated by comma. 
+
+In the (condition) expression, all the comma separated expressions will be evaluated. 
+
+The result is obtained from the last one.
+
+For loops are commonly used to count a certain number of iterations to repeat a statement.
+
+### Common Pitfalls
+
+#### Exceeding the bounds of an array
+
+When indexing over an array many times it is easy to exceed the bounds of the array (ex. try to reference the 4th element of a 3 element array).
+
+```php
+// This will cause an error.
+// The bounds of the array will be exceeded.
+$arr = array(1,2,3);
+
+for ($i = 0; $i <= count($arr); $i++) {
+    var_dump($arr[$i]);
+}
+```
+
+This will output:
+
+```txt
+int(1) int(2) int(3) NULL
+```
+
+There are to ways to fix this code. 
+
+Set the condition to either `$i < count($arr)` or `$i <= count($arr) - 1`.
+
+#### Performance Issues
+
+The above code can became slow, because the array size is fetched in every iteration. 
+
+In order to fix this problem it is possible to put the array size into a variable.
+
+```php
+//create the $size variable with a second expression comma separated
+for ($i = 0, $size = count($arr); $i < $size; ++$i) {
+```
+
+### More Information
+
+- <a href='https://secure.php.net/manual/en/control-structures.for.php' target='_blank' rel='nofollow'>PHP.net - Control Structures</a> 

guide/english/php/loops/index.md

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+---
+title: Loops
+---
+
+## Loops
+
+Loops are used in PHP to perform repeated tasks based on a condition. 
+
+Conditions typically return `true` or `false` when analysed. 
+
+A loop will continue running until the defined condition returns `false`.
+
+You can type `php for` , `php while` or `php do while` to get more info on any of these.
+
+### More Information
+
+- <a href='https://secure.php.net/manual/control-structures.for.php' target='_blank' rel='nofollow'>PHP.net - For Loops</a>

guide/english/php/loops/while-loop/index.md

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+---
+title: While Loop
+---
+## While Loop
+
+The `while loop` is one of the easiest type of loop in PHP. It executes the block of statements until the expression evaluates to **TRUE**. If the value of the expression changes at the time of execution, then the loop runs until the expression evaluates to **FALSE**.The Basic Form of While Loop is given below:
+
+```shell
+while (expr)
+    statement
+```
+The Statements inside the while loop can be enclosed within the curly braces or can be used based on the following syntax:
+
+```shell
+while (expr):
+    statement
+    ...
+endwhile;
+```
+Illustrating the simple and alternate syntax of while loop using example:
+
+```php
+<?php
+
+/* using the simple form of while loop */
+
+$i = 1;  /* initialisation part */
+
+while ($i <= 100 && $i!=5 ) 
+{
+    echo $i++;  
+}
+
+/*using the alternate synatx of while loop*/
+
+$i = 0;
+
+while ($i <= 10):
+    echo $i++;
+endwhile;
+
+?>
+```
+
+#### More Information
+
+[While loop - PHP Documentation](http://php.net/manual/en/control-structures.while.php)