Question

我正在尝试使用php脚本将json文件转换为csv格式。代码如下：

if (empty($argv[1])) die("The json file name or URL is missed\n");
$jsonFilename = $argv[1];

$json = file_get_contents($jsonFilename);
$array = json_decode($json, true);
$f = fopen('output.csv', 'w');

$firstLineKeys = false;
foreach ($array as $line)
{
    if (empty($firstLineKeys))
    {
            $firstLineKeys = array_keys($line);
            fputcsv($f, $firstLineKeys);
            $firstLineKeys = array_flip($firstLineKeys);
    }

fputcsv($f, array_merge($firstLineKeys, $line));

}

这种工作，但只返回JSON文件的外部变量，并且得到“数组到字符串转换”警告

JSON数据如下所示：

{"type":"NON_ATTRIBUTED","conversion":{,"value_1":"000000100355321","value_3":"XXXX","value_4":"12667","value_5":"6"},"stream_type":"COOKIE"}
{"type":"ATTRIBUTED","conversion":{,"value_1":"000000167865321","value_3":"YYYY","value_4":"12668","value_5":"0"},"stream_type":"COOKIE"}
{"type":"NON_ATTRIBUTED","conversion":{,"value_1":"000000134535321","value_3":"AAAA","value_4":"12669","value_5":"9"},"stream_type":"COOKIE"}
{"type":"NON_ATTRIBUTED","conversion":{,"value_1":"000000100357651","value_3":"WWWW","value_4":"12670","value_5":"2"},"stream_type":"COOKIE"}

我得到的输出是：类型，转换，的stream_type NON_ATTRIBUTED，阵列，COOKIE NON_ATTRIBUTED，阵列，COOKIE

我期待的输出是： type，conversion，value_1，value_3，value_4，value_5，stream_type NON_ATTRIBUTED，000000100355321，XXXX，1267,6，COOKIE ..

任何帮助表示赞赏，因为这对我来说很新鲜

Answer 1

json_decode（$ json，true）;将JSON对象转换为关联数组。所以这个

{
    "type":"NON_ATTRIBUTED",
    "conversion":{,
        "value_1":"000000100355321",
        "value_3":"XXXX",
        "value_4":"12667",
        "value_5":"6"
    },
    "stream_type":"COOKIE"
}

成为这个：

array(3) { 
    ["type"]=> string(14) "NON_ATTRIBUTED" 
    ["conversion"]=> array(4) { 
        ["value_1"]=> string(15) "000000100355321" 
        ["value_3"]=> string(4) "XXXX" 
        ["value_4"]=> string(5) "12667" 
        ["value_5"]=> string(1) "6" 
    } 
    ["stream_type"]=> string(6) "COOKIE" 
}

如您所见，有嵌套数组。并且您尝试使用以下行将所有数组元素插入到文本文件中（csv只是一个简单的文本文件）：

fputcsv($f, array_merge($firstLineKeys, $line));

当数组的元素是字符串时它很好用。但是当元素是数组时，我们将Array转换为字符串。所以你必须在嵌套数组上使用loop或array_merge来防止这种情况。

我无法清楚地了解您的csv必须如何，但我希望您的代码修复可以帮助您。如果没有，请在下面写下评论。

if (empty($argv[1])) die("The json file name or URL is missed\n");
$jsonFilename = $argv[1];

$json = file_get_contents($jsonFilename);
$array = json_decode($json, true);
$f = fopen('output.csv', 'w');

$firstLineKeys = false;
foreach ($array as $line)
{
    if (empty($firstLineKeys))
    {
        $firstLineKeys = array_keys($line);
        fputcsv($f, $firstLineKeys);
        $firstLineKeys = array_flip($firstLineKeys);
    }
    $line_array = array($line['type']);
    foreach ($line['conversion'] as $value)
    {
        array_push($line_array,$value);
    }
    array_push($line_array,$line['stream_type']);
    fputcsv($f, $line_array);

}

你的json中也有一个错误 - 不需要的逗号："conversion":{,

使用PHP将JSON转换为CSV格式

1 个答案: