title: (Array PHP) The shortest way to plus two arrays
body: <p>I assume that I have two array like:</p>
  
  <pre><code>$arr1 = array('a' =&gt; 1,'b',null,1);
  $arr2 = array('c', 'a' =&gt; 2, array());
  </code></pre>
  
  <p>I want to:</p>
  
  <pre><code>$arr1 + $arr2 = array(array('a'=&gt;1),'b',null,1,'c', array('a'=&gt;2), array());
  $arr2 + $arr1 =  array('c', array('a'=&gt;2), array(),array('a'=&gt;1),'b',null,1);
  </code></pre>
  
  <p>which functions help me do these above things. Thanks.</p>
  
  <p>See my edit.</p>