我怎樣才能確保有一定數量的小數（尾隨零）

在我的網站上，有金額被迴應。當我從金額中扣除時，它會刪除尾部零，直到我註銷並重新登錄到我的帳戶。有沒有辦法檢查小數點後面總是有兩個數字，如果沒有，就添加一個零點？我怎樣才能確保有一定數量的小數（尾隨零）

這裏是我的PHP減法代碼：

<?php 
session_start(); 

$servername = "localhost"; 
$username = "root"; 
$password = "patrick2002"; 
$dbname = "accounts"; 
$cash_amount = $_SESSION['cash_amount']; 

// Create connection 

$userid = $_SESSION['id']; 

// You must enter the user's id here. /\ 

$conn = new mysqli($servername, $username, $password, $dbname); 
// Check connection 

if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 

// Fetch the existing value of the cash_amount against that particular user here. You can use the SELECT cash_amount from users where userid = $userid 
$_SESSION['cash_amount'] -= 0.05; 
$newAmount = $cash_amount - 0.05; 

$sql = "UPDATE users SET cash_amount = $newAmount WHERE id = $userid"; 
$result = $conn->query($sql); 

if($result) 
{ 
    echo "5 cents has been subtracted!"; 
} 
else 
{ 
    echo mysqli_error($conn); 
} 

$conn->close(); 
?>

這裏是我的PHP回聲代碼：

<?php echo '$'.$cash_amount ?>

在文檔的開頭：

$cash_amount = $_SESSION['cash_amount'];

所以，如果你可以幫助我，我會非常感激。多謝你們！

來源

2017-07-30 Patrick

嘗試['sprintf'（http://php.net/manual/en/function.sprintf.php）或['str_pad']（http://php.net/manual/en/function.str-pad.php）。 – Tigger

嘗試

echo sprintf('%0.2f', $cash_amount);

或者在你的HTML/PHP：

... 
$<?php echo sprintf('%0.2f', $cash_amount) ?> 
...

來源

2017-07-30 10:48:52 RichGoldMD

完美！謝謝一堆！ – Patrick

我怎樣才能確保有一定數量的小數（尾隨零）

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