index undefined php with $_POST
Question
I am trying to get rid of the index undefined. Every time I click submit without ticking the box, I get an undefined index error.
<html>
<head>
<title>Order</Title>
<style>
</style>
<body>
<form action = "order.php" method = "post">
Coffee:<p>
<input type = "checkbox" value = "coffee" name = "cappuccino"/>Capuccino<br>
</form>
</body>
</head>
</Html>
<?php
$capuccino = 3.75;
if(isset($_POST["submit"]))
{
if($_POST['cappuccino'] <> 'coffee')
{
$capuccino = 0;
}
}
?>
4 answers
solution1
1 ACCPTED 2013-08-31 09:51:47
Try with isset like
<?php
if(isset($_POST["submit"]))
{
if(isset($_POST['cappuccino']) && $_POST['cappuccino'] <> 'coffee')
{
$capuccino = 0;
}
}
?>
You can also use != instead <>
$_POST['cappuccino'] != 'coffee'
solution2
1 2013-08-31 09:52:52
In HTML forms, a value does not get posted if you do not check it. You should test if it was posted first, so your php code would be something like:
<?php
if(isset($_POST["submit"]))
{
if(isset($_POST['cappuccino']) && $_POST['cappuccino'] <> 'coffee')
{
$capuccino = 0;
}
}
?>
solution3
0 2013-08-31 09:53:14
你的条件应该是：
if(array_key_exists('cappuccino', $_POST) && isset($_POST['cappuccino']) && $_POST['cappuccino'] <> 'coffee')
solution4
0 2013-08-31 09:53:42
<html>
<head>
<title>Order</Title>
<style>
</style>
<body>
<form action = "order.php" method = "post">
Coffee:<p>
<input type = "checkbox" value = "coffee" name = "cappuccino"/>Capuccino<br>
<input type="submit" name="submit" value="Submit" />
</form>
</body>
</head>
</Html>
<?php
$capuccino = 3.75;
if(isset($_POST["submit"]))
{
if(isset($_POST['cappuccino']) && !empty($_POST['cappuccino']) <> 'coffee')
{
$capuccino = 0;
}
}
?>
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