title: php: pushing to an array that may or may not exist
body: <p>I want to create an array with a message.</p>
  
  <pre><code>$myArray = array('my message');
  </code></pre>
  
  <p>But using this code, <code>myArray</code> will get overwritten if it already existed. </p>
  
  <p>If I use <code>array_push</code>, it has to already exist.</p>
  
  <pre><code>$myArray = array(); // &lt;-- has to be declared first.
  array_push($myArray, 'my message');
  </code></pre>
  
  <p>Otherwise, it will bink. </p>
  
  <p>Is there a way to make the second example above work, without first clearing <code>$myArray = array();</code>?</p>