intval is not reading decimals

[Monkuar]

$_POST['amount'] = intval($_POST['amount']);
if ($_POST['amount'] < 0){
message($lang_common['Bad request']);
}
if (!is_numeric($_POST['amount'])){
message($lang_common['Bad request']);
}
echo $pun_user['gold'];
echo '<br>';
echo $_POST['amount'];
exit;

 

if I enter 0.05

in my gold input textbox and submit it, it reads 0, it doesn't read the decimal values, i need it to read them, but I also need it to be secure and use intval.. help

[PFMaBiSmAd]

floatval

[Monkuar]

floatval

 

you sir

 

have won the internet, congrats