title: Can a namespace start with a number in PHP?
body: <p>When declaring the following namespace:</p>
  
  <pre><code>&lt;?php
  
  namespace Example\3000;
  </code></pre>
  
  <p>I got this error:</p>
  
  <pre><code>Parse error:  syntax error, unexpected '3000' (T_LNUMBER), expecting identifier (T_STRING) in [...]
  </code></pre>
  
  <p>So I wondered whether a namespace in PHP may start with a number?</p>