fix(guide): simplify directory structure

guide/english/php/operators/index.md

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+---
+title: Operators
+---
+
+## Operators
+
+
+PHP contains all the normal operators one would expect to find in a programming language. 
+
+A single “=” is used as the assignment operator and a double “==” or triple “===” is used for comparison. 
+
+The usual “<” and “>” can also be used for comparison and “+=” can be used to add a value and assign it at the same time.
+
+Most notable is the use of the “.” to concatenate strings and “.=” to append one string to the end of another.