Question

我在php中创建了一个WebService，用于从mySQL DB获取数据并返回JSON。

所以，我需要这样，每当我的数据库中有null value时，此值都会更改为白色（= " "）。

我这样做了，但没有成功（看看最后foreach）：

<?php

header("Content-Type: application/json; charset=utf-8;");

include('connectdb.php');

$something = $_GET['cod'];
$sqlcode = mysql_query("Select descricao, cliente, local from terminal_cartao Where     descricao='$something'");
$sqlcode2 = mysql_query("Select descricao, cliente, local from terminal_cartao");

$jsonObj= array();

if($something == 'all')
{

while($result=mysql_fetch_object($sqlcode2))
{
$jsonObj[] = $result;
}

}

else{
while($result=mysql_fetch_object($sqlcode))
{
$jsonObj[] = $result;
}
}

foreach ($jsonObj as $key => $value) {
if ($value === null) {
    $jsonObj[$key] = ""; 
}
}

$final_res =json_encode($jsonObj);
echo $final_res;
exit;

Answer 1

foreach ($jsonObj as $key => $value) {
  $value = get_object_vars($value);
  foreach($value as $key2 => $value2) {
    if ($value2 === null) {
      $jsonObj[$key]->$key2 = ""; 
    }
  }
}

Answer 2

下面的代码对我来说很好用：

foreach ($jsonObj as $k1 => $row) {
foreach ($row as $k2 => $value) {
    if ($value === null) {
        $jsonObj[$k1]->$k2 = "";
    }
}
}

null时替换数组的值

2 个答案: