我如何去取代PHP中的数组中的索引值

Question

我想要做的是在用户名匹配的索引处替换JSON数组的值。我如何去做这件事？以下是我的试用PHP代码和我的JSON。使用array_replace是最好的方式，还是应该以不同的方式进行操作？

<?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 and pass by reference

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;