title: mysqli_fetch_array() or mysqli_fetch_all()?
body: <p>I see comparisons between <code>mysqli_fetch_array()</code> and <code>mysqli_fetch_all()</code> that say that with <code>mysqli_fetch_all()</code> it will take more memory and I will have to iterate over the array.</p>
  
  <p><code>mysqli_fetch_all()</code> is one call to <code>mysqli</code> but <code>mysqli_fetch_array()</code> is one call per row, for example 100 calls. </p>
  
  <p>I don't know how the mysqli processing works: is calling <code>mysqli_fetch_array()</code> really more efficient when you also take the number of calls into account?</p>
  
  <p>(I already understand that the returned data can be associative arrays or not)</p>