title: PHP array_merge with numerical keys
body: <p>How can make it so array_merge() overwrites two keys with different values but same key index from two arrays?</p>
  
  <p>for example, merging:</p>
  
  <p><code>[0] =&gt; 'whatever'</code></p>
  
  <p>with</p>
  
  <p><code>[0] =&gt; 'whatever', [1] =&gt; 'a', [2] =&gt; 'b'</code></p>
  
  <p>should produce</p>
  
  <p><code>[0] =&gt; 'whatever', [1] =&gt; 'a', [2] =&gt; 'b'</code></p>
  
  <p>Basically I want array_merge to bahave the same way it behaves if the arrays have string keys...</p>