php - PHPの配列のインデックスの値を置き換えるにはどうすればよいですか

Question

私がやろうとしているのは、ユーザー名が一致するインデックスで JSON 配列の値を置き換えることです。どうすればこれを行うことができますか？以下は、私の試用版 PHP コードと JSON です。array_replace を使用するのが最善の方法ですか、それとも別の方法で行う必要がありますか?

<?php 
 $user_with_game = file_get_contents("oneuser.json");//$_POST["userGames"];
//$user_with_game = stripslashes ($JSON);
$user_decoded_JSON = json_decode($user_with_game, true);

$JSON = file_get_contents("users.json");
$decoded_JSON = json_decode($JSON, true);

//print_r ($user_decoded_JSON);

foreach ($decoded_JSON['Users'] as $key => $value)
{
    if ( $value['username'] == $user_decoded_JSON['username'])
    {
        $decoded_JSON['Users'] = array_replace($decoded_JSON['Users'],      $user_decoded_JSON);
    }
}

//print_r ($decoded_JSON);
$encoded_JSON = json_encode( $decoded_JSON);
echo $encoded_JSON;
 ?>



**users.json**
{
"Users":[
  {
     "password":"glass",
     "gamelist":[
        {
           "platform":"xbox-360",
           "game":"bioshock infinite"
        },
        {
           "platform":"xbox-360",
           "game":"tomb raider"
        }
     ],
     "username":"dorinayres",
     "reviewerlist":[

     ]
  },
  {
     "password":"happy",
     "gamelist":[
        {
           "platform":"xbox-360",
           "game":"far cry 3"
        },
        {
           "platform":"xbox-360",
           "game":"terraria"
        }
     ],
     "username":"ian",
     "reviewerlist":[

     ]
  }
  ]
}


**oneuser.json**
 {
"password":"glass",
 "gamelist":[
 {
     "platform":"xbox-360",
     "game":"bioshock infinite"
  },
  {
     "platform":"xbox-360",
     "game":"tomb raider"
  }
],
"username":"dorinayres",
"reviewerlist":[

]
}

Answer 1

PHP foreach と参照渡し

foreach($decoded_JSON['Users'] as &$user){
    if($user['username'] == $user_decoded_JSON['username']){
        //do something directly on $user here and it will effect the actual array
    }
}

Answer 2

$decoded_JSON_tmp=$decoded_JSON;
foreach ($decoded_JSON['Users'] as $key => $value)
{
    if ( $value['username'] == $user_decoded_JSON['username'])
    {
        $decoded_JSON_tmp['Users'] = array_replace($decoded_JSON['Users'],      $user_decoded_JSON);
    }
}
$decoded_JSON=$decoded_JSON_tmp;