title: String contains x amount of numbers and text
body: <p>I would like to check in php if a string contains 4 numbers plus a space and then text.</p>
  
  <p>Something like this: <code>1234 asdf</code></p>
  
  <pre><code>If there are more or less then 4 numbers =&gt; false  
  If there is no text after the numbers =&gt; false
  </code></pre>
  
  <p><em>How can I do this the proper way?</em></p>