JSON returned from Memcache is invalid

Question

I have Drupal 7 site. I am using Memcache for caching.

This is how I am storing the JSON into it

    //creating an object of Memcache
    $cache = new Memcache();
    $cache ->addServer('localhost', 11211);
    //adding a key
    $cacheKey = 'mobile';
    //delete old cache
    $cache ->delete($cacheKey);
    //refresh cache
    $cache ->set($cacheKey, serialize($jsonData));

No issue till here. But when fetching the JSON from this cache.

returned JSON fails to validate

I am using http://jsonlint.com/ to validate my JSON.

Please note the however the JSON has correct data but issue is validation.

$Records = $cache->get($cacheKey);

echo '<pre>';
print_r(Records);
exit();

Any help highly appreciated.

JSON returned on var_dump() as mentioned in ans by Jeroen

string '{"defaults":[{"nid":"213","public_url":"http:\/\/www.mywebsite.com","current_ver'... (length=3033)

Answer 1

You are using serialize() when you store your data, so you need to use unserialize() when you get it:

$cache->set($cacheKey, serialize($jsonData));

...

$jsonData = unserialize($cache->get($cacheKey));

Although there is not really any need to serialize the data as Memcache will take care of that:

$cache->set($cacheKey, $jsonData);

...

$jsonData = $cache->get($cacheKey);

Edit:

To see what you have exactly:

var_dump($cacheKey);
var_dump($jsonData);
$cache->set($cacheKey, $jsonData);

...

$jsonData = $cache->get($cacheKey);
var_dump($cacheKey);
var_dump($jsonData);