title: What type does fwrite() returns?
body: <p>On the php manual we can read:</p>
  
  <blockquote>
    <p><strong>fwrite()</strong> returns the number of bytes written</p>
  </blockquote>
  
  <p>Ok... but what kind of thing is "number of bytes written"?</p>
  
  <p>Binary string? Binary number? Stream? Int? </p>
  
  <p>I'm a little bit lost here.</p>
  
  <p>Regards</p>