title: Combine Two Arrays with numerical keys without overwriting the old keys
body: <p>I don't want to use array_merge() <strike>as it results in</strike> i misunderstood that  all values with the same keys would be overwritten. i have two arrays</p>
  
  <pre><code>$array1 = array(0=&gt;'foo', 1=&gt;'bar');
  $array2 = array(0=&gt;'bar', 1=&gt;'foo');
  </code></pre>
  
  <p>and would like to combine them resulting like this</p>
  
  <pre><code>array(0=&gt;'foo', 1=&gt;'bar',2=&gt;'bar', 3=&gt;'foo');
  </code></pre>