title: How to PHP decode JSON from MYSQL
body: <p>On <strong>MySQL</strong> I have this <strong>JSON</strong> value </p>
  
  <pre><code>{"length":1847,"data":[0,0,0,0,-46,37]}
  </code></pre>
  
  <p>On <strong>PHP</strong> I need to string in array the "data" objects, so I tried:</p>
  
  <pre><code>$json = $row['wave'];
  $json_array = json_decode($json);
  $json_wave = $json_array["data"];
  </code></pre>
  
  <p>It gives me <code>internal server error 500</code>, so I tried: </p>
  
  <pre><code>var_dump(json_decode($json));
  </code></pre>
  
  <p>What I got is:</p>
  
  <pre><code>object(stdClass)#7 (5) {
    ["length"]=&gt;
    int(1847)
    ["data"]=&gt;
    array(3694) {
      [0]=&gt;
      int(0)
      [1]=&gt;
      int(0)
      [2]=&gt;
      int(0)
      [3]=&gt;
      int(0)
      [4]=&gt;
      int(-46)
      [5]=&gt;
      int(37)
    }
  }
  </code></pre>
  
  <p>I need to output this string <code>0,0,0,0,-46,37</code>, why is my code not working?</p>