fix: matching stack vars

Author: xepozz

src/main/kotlin/com/github/xepozz/php_opcodes_language/language/psi/impl/PHPOpPsiImplUtil.kt

@@ -6,5 +6,6 @@ class PHPOpPsiImplUtil {
     companion object {
         @JvmStatic
         fun isVariable(element: PHPOpParameter): Boolean = element.text.startsWith("$")
+        fun isVariable(element: PHPOpParameter): Boolean = element.text.matches(Regex("[TV]\\d+"))
     }
 }