title: Left join two JSONs
body: <p>It is possible to JOIN, find and print not joined row on PHP two JSONs? 
  Data looks like that:</p>
  
  <pre><code>[{"column_name":"test","position":10},{"column_name":"test2","position":12},{"column_name":"test3","position":14}]
  
  [{"dbcolumnname":"test"},{"dbcolumnname":"test3"}]
  </code></pre>
  
  <p>Ouput should looke like this:</p>
  
  <pre><code>[{"column_name":"test2","position":12}]
  </code></pre>
  
  <p>Thanks in advance for help.</p>