title: PHP giving 8.8817841970013E-016 instead of 0
body: <p>I am doing a simple calculation in PHP.</p>
  
  <p><code>(2.70 + 2.30 + 29.70 + -2.30 + -29.70 + -2.70)</code> - got these figures from a database</p>
  
  <p>PHP is giving <code>8.8817841970013E-016</code> as answer instead of zero.</p>
  
  <p>I have tried functions like round, number_format but still get the same results</p>