加入以下幾天語句頁變成空白，刪除正常
echo "isset($tireqty)".isset($tireqty)."
";
echo "isset($nothere)".isset($nothere )."
";
echo "isset($tireqty)".empty($tireqty)."
";
echo "isset($nothere)".empty($nothere)."";
下面列出完整程式碼
<code> <head>
<title>Bob's Auto Parts -Order Result</title>
</head>
<body>
<h1>Bos's Auto Parts</h1>
<h2>Order Result</h2>
<?php
define('TIREPRICE',100);
define('OILPRICE',10);
define('SPARKPRICE',4);
$tireqty = $_POST['tireqty'];
$oilqty = $_POST['oilqty'];
$sparkqty = $_POST['sparkqty'];
echo " <p>Order processed at".date('H:i, jS F Y')."</p>";
echo " <p>Your order is as follow:</p>";
echo $tireqty." tireqty<br/>";
echo $oilqty." oilqty<br/>";
echo $sparkqty." spark plugs <br/>";
$totalqty = 0;
$totalqty = $tireqty + $oilqty + $sparkqty;
echo "Items ordered: ".$totalqty."<br/>";
$totalamount = 0.00;
$totalamount = $tireqty * TIREPRICE +
$oilqty * OILPRICE + $sparkqty * SPARKPRICE;
echo "Subtotal: $".number_format($totalamount,2)."<br/>";
$taxrate = 0.10; //total sales tax is 10%
$totalamount = $totalamount * (1 + $taxrate);
echo "Total including tax: $".number_format($totalamount,2)."<br/>"</code>// echo "isset($tireqty)".isset($tireqty)."
";
// echo "isset($nothere)".isset($nothere)."
";
// echo "isset($tireqty)".empty($tireqty)."
";
// echo "isset($nothere)".empty($nothere)."
";
<code> ?>
</body></code>加入以下幾天語句頁變成空白，刪除正常
echo "isset($tireqty)".isset($tireqty)."
";
echo "isset($nothere)".isset($nothere )."
";
echo "isset($tireqty)".empty($tireqty)."
";
echo "isset($nothere)".empty($nothere)."";
下面列出完整程式碼
<code> <head>
<title>Bob's Auto Parts -Order Result</title>
</head>
<body>
<h1>Bos's Auto Parts</h1>
<h2>Order Result</h2>
<?php
define('TIREPRICE',100);
define('OILPRICE',10);
define('SPARKPRICE',4);
$tireqty = $_POST['tireqty'];
$oilqty = $_POST['oilqty'];
$sparkqty = $_POST['sparkqty'];
echo " <p>Order processed at".date('H:i, jS F Y')."</p>";
echo " <p>Your order is as follow:</p>";
echo $tireqty." tireqty<br/>";
echo $oilqty." oilqty<br/>";
echo $sparkqty." spark plugs <br/>";
$totalqty = 0;
$totalqty = $tireqty + $oilqty + $sparkqty;
echo "Items ordered: ".$totalqty."<br/>";
$totalamount = 0.00;
$totalamount = $tireqty * TIREPRICE +
$oilqty * OILPRICE + $sparkqty * SPARKPRICE;
echo "Subtotal: $".number_format($totalamount,2)."<br/>";
$taxrate = 0.10; //total sales tax is 10%
$totalamount = $totalamount * (1 + $taxrate);
echo "Total including tax: $".number_format($totalamount,2)."<br/>"</code>// echo "isset($tireqty)".isset($tireqty)."
";
// echo "isset($nothere)".isset($nothere)."
";
// echo "isset($tireqty)".empty($tireqty)."
";
// echo "isset($nothere)".empty($nothere)."
";
<code> ?>
</body></code>
前面的引號類別的變數$nothere沒有定義會報錯，你沒有開啟debug模式就不會報錯，也不會顯示
isset和empty回傳的都是bool類型，自然是不會顯示的
echo "isset($tireqty)"...如果$tireqty沒有定義會出錯，因為這裡雙引號裡面的isset是作為字元輸出的
error_reporting(E_ALL);
ini_set("display_errors", 1);
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