$D20 = 1;
$D21 = 1;
$D22 = 1;
$D23 = 1;
$result = (log($D20+1, 5)+log($D21+1, 2))*($D22*$D22)/25*$D23;
echo $result;
$( "#success" ).load( "/not-here.php", function( response, status, xhr ) {
if ( status == "error" ) {
var msg = "Sorry but there was an error: ";
$( "#error" ).html( msg + xhr.status + " " + xhr.statusText );
}
});