fix(guide): simplify directory structure

guide/english/php/php-switch/index.md

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+---
+title: PHP Switch
+---
+## PHP Switch
+
+The `switch` statement in PHP is similar to a series of `if ` statements on same expression. The `switch` statement is used to execute different actions at different conditions. The Syntax of the `switch` statement is follows
+
+```
+switch (expression) {
+
+    case label1:
+        // code block to be executed if there is a match with result of expression
+        break;      
+    case label2:
+        // code block to be executed if there is a match with result of expression
+        break;
+    case label3:
+        // code block to be executed if there is a match with result of expression
+        break;
+    default:
+        // code block to be executed if there is no match with result of expression
+
+}
+
+```
+When we run the program , the expression inside the `switch` statement is evaluated. The result of that expression is checked with corresponding labels if there is a match then corresponding `case` block is executed.  If no match is found with any of the case statements, only the block of code following the `default` are executed. 
+
+Illustration of `switch` statement with an example
+
+```
+<?php
+
+$i = 1
+switch ($i) {
+    case 0:
+        echo "i equals 0";
+        break;
+    case 1:
+        echo "i equals 1";
+        break;
+    case 2:
+        echo "i equals 2";
+        break;
+}
+
+?>
+
+```
+The `switch` statement can also be used without `break` statement. In that case , statements after the matched cases will be executed. Below is an usage of `switch` statement without `break` statement.
+
+```
+<?php
+switch ($i) {
+    case 0:
+        echo "i equals 0";
+    case 1:
+        echo "i equals 1";
+    case 2:
+        echo "i equals 2";
+}
+?>
+
+/*output --> i equals 0i equals 1i equals 2 */
+
+```
+#### More Information:
+[Switch Statement - PHP Documentation](http://php.net/manual/en/control-structures.switch.php)
+
+[PHP5 Switch - W3Schools](https://www.w3schools.com/php/php_switch.asp)