title: Store a JavaScript array in the DB and get array back when needed
body: <p>I have a multidimensional associative JavaScript array with some metabox data and I need to store that array in the WordPress database (in a single column).</p>
  
  <p>And I also want to get that stored array back in the metabox call back function and use the values in the array to populate the relevant fields. </p>
  
  <p>This is what I've done so far...</p>
  
  <pre><code>    var data = [
          { key: 'cardK', val: 13 },
          { key: 'cardQ', val: 12 },
          { key: 'cardAJ', val: 11 },
      ];
      var serializedData= JSON.stringify( data );
  </code></pre>
  
  <p>This outputs a string look like this</p>
  
  <pre><code>[[1,2],[3,4],[5,6]]
  </code></pre>
  
  <p>Now I can store this in the DB in a single column. But how can I get this back as an array and use it to populate the fields ?</p>