Check Balance Auto Send

<?php
$getinfo = shell_exec('./zetacoind getinfo');
echo "<pre>$getinfo[0]->balance</pre>";
if ($getinfo[0]->balance>="20")
  {
  echo "shell_exec('./zetacoind sendtoaddress blahblahblah')";
  echo "Coins have been sent!";
  }
else
  {
  echo "Balance too low.";
  }
?>