add enum test case to php generator (java)

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/AbstractPhpCodegen.java

@@ -579,6 +579,11 @@ public abstract class AbstractPhpCodegen extends DefaultCodegen implements Codeg
 
     @Override
     public String toEnumVarName(String name, String datatype) {
+        // for symbol, e.g. $, #
+        if (getSymbolName(name) != null) {
+            return (getSymbolName(name)).toUpperCase();
+        }
+
         // number
         if ("int".equals(datatype) || "double".equals(datatype) || "float".equals(datatype)) {
             String varName = new String(name);