在PHP中使用fputcsv将json写入CSV时如何编码\“to \”？

I'm writing a complex object into CSV. There are strings containing \" in the object. When fputcsv encoding the object into CSV using json, it doesn't encode \" to \"",so I can't processing the CSV file correctly. How can I encode the object correctly using fputcsv? Or how can I process the csv like that?

PHP 5.6.39 Mac OS 10.14.4 Nginx 1.15.8

$fileName = 'test.csv';
$file = fopen($fileName, 'a+');

$json = '[{"action":"{\"type\":\"showSearch\"}","time":1552458671}]';
$value = [$json];
fputcsv($file, $value);

fclose($file);

Expected output:

"[{""action"":""{\""type\"":\""showSearch\""}"",""time"":1552458671}]"

Actual output:

"[{""action"":""{\"type\":\"showSearch\"}"",""time"":1552458671}]"