title: create new array from a multidimensional array
body: <p>I have this multidimensional array: </p>
  
  <pre><code>Array (
      [0] =&gt; Array ( 
          [id] =&gt; 1 
          [list_name] =&gt; List_Red
      ) 
      [1] =&gt; Array (
          [id] =&gt; 2
          [list_name] =&gt; List_Blue 
      )
  )
  </code></pre>
  
  <p>...and i would like to create a new array containing only the [id]'s from it.</p>
  
  <p>I would appreciate it alot if you guys could help me with that ^^</p>
  
  <p>Thanks in advance.</p>