title: What does \x00 mean in binary file?
body: <p>Once I asked a guy "what is the difference between ASCII and Binary files?"</p>
  
  <p>And he said "Binary files always have \x00"</p>
  
  <p>I've been searching about this and found <a href="https://stackoverflow.com/questions/1182812/what-is-the-meaning-of-x00-x04-in-php">What is the meaning of \x00 , \x04 in PHP</a></p>
  
  <p>so the conclusion is, ASCII files don't have NULL character?</p>