title: How do I combine two arrays without repeating values?
body: <p>I have two arrays:</p>
  
  <pre><code>array('1','2','3','4');
  array('4','5','6','7');
  </code></pre>
  
  <p>Based on them, I'd like to generate an array that contains only unique values:</p>
  
  <pre><code>array('1','2','3','4','5','6','7');
  </code></pre>
  
  <p>Is there any suitable function for this in PHP?</p>