title: dynamically inserting value to array with index
body: <p>Pushing values to an array caused the index to start with 0 if the index were any other values except starting from 0.</p>
  
  <pre><code>$a=array("a"=&gt;"Dog","b"=&gt;"Cat");
  array_push($a,"Horse","Bird");
  </code></pre>
  
  <p>this will insert Horse and Bird with index 0 and 1.</p>
  
  <p>Can I insert those values with different index? like </p>
  
  <pre><code>speed =&gt; Horse
  fly =&gt; Bird
  </code></pre>