php Or for same variable code example

Example 1: assign value php

reset($val['MemberSaveRoom'])['is_favour_room'] = true; // INCORRECT
$val['MemberSaveRoom'][0]['is_favour_room'] = true; 	// CORRECT

// result 
MemberSaveRoom = array(
  [0] = array(
    'is_favour_room' => true,
  ));

Example 2: php variables

<?php
  $string = 'string';
  $number = 1;
?>