</tr>
  </table>
  </dd>
</dl>
<p>The exponent, as a string. If the exponent is non-integral, it is truncated. The valid range of the exponent is platform specific, but is at least -2147483648 to 2147483647. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramtype">int</td><td class="paramname">$scale</td><td>[optional] </td></tr>
  </table>
  </dd>
</dl>
<p>This optional parameter is used to set the number of digits after the decimal place in the result. If omit