fix(guide): simplify directory structure

guide/english/php/variable-basics/index.md

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+---
+title: PHP Variable Basics
+---
+Variables allow programmers to use data throuhgout a PHP script.
+
+In PHP, variables always start with a `$` symbol followed by the name of the variable. Only letters, numbers (may not be the first character), and underscores can make up the name of a variable.
+
+For example, `$my_variable`, `$anotherVariable`, and `$the2ndVariable` are allow valid variable names.
+
+Variable names are case-sensitive. `$my_variable` is different from `$My_Variable` which is different from `$mY_vARiAblE`.
+
+Before a variable can be used, it must have a value assigned to it.
+
+````PHP
+    <?php
+    $my_number = 1;
+    echo($my_number);
+    
+    >>> 1
+````
+
+In the example above, the variable is `$my_number`. The value assigned to it was the number `1`. The variable was then passed as a parameter to the `echo` function, which output the value to the command line.