Arg... POST variables are messed up?

loginbin3000

Here is a page that ive made using post to send variables from a form.

<?
if(isset($_POST['submit']))
{
if(!isset($_POST['firstname']))
{
echo 'OMGZOR';
}
else
{
echo '-->';
echo $_POST['firstname'];
}
}
?>
<br><Br>
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<form action="index.php?ID=signup" method="POST">
<table>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">First Name:</font>
</td>
<td>
<input type="text" name="firstname" value="">
</td>
<td>
<font face="OCR A Extended" size="1" color="#5399a5"><i>required</i></font>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Last Name:</font>
</td>
<td>
<input type="text" name="lastname">
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Username:</font>
</td>
<td>
<input type="text" name="username">
</td>
<td>
<font face="OCR A Extended" size="1" color="#5399a5"><i>required</i></font>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Password:</font>
</td>
<td>
<input type="password" name="password1">
</td>
<td>
<font face="OCR A Extended" size="1" color="#5399a5"><i>required</i></font>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Password (Again):</font>
</td>
<td>
<input type="password" name="password2">
</td>
<td>
<font face="OCR A Extended" size="1" color="#5399a5"><i>required</i></font>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Total posts in our forums:</font>
</td>
<td>
<input type="text" name="postcount" value="-=OFFLINE=-" disabled>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Email:</font>
</td>
<td>
<input type="text" name="email1">
</td>
<td>
<font face="OCR A Extended" size="1" color="#5399a5"><i>required</i></font>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Email (Again):</font>
</td>
<td>
<input type="text" name="email2">
</td>
<td>
<font face="OCR A Extended" size="1" color="#5399a5"><i>required</i></font>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Why should we accept you?</font>
</td>
<td>
<textarea type="text" name="reason"></textarea>
</td>
</tr>
<tr>
<td>
<font face="OCR A Extended" size="1" color="#5399a5">Submit:</font>
</td>
<td>
<input type="submit" value="Go!" name="submit">
</td>
</tr>
</table>
</form>

Now whats fustrating is that whenever i submit the form and deliberatly leave the firstname field empty, it returns as '-->' or '--> '
But if it was like that, then why did it ignore the (!isset) tag... erm.. help!

oneboy

<? 
if(isset($_POST['submit'])) 
{ 
if(!$_POST['firstname']) 
{ 
echo 'OMGZOR'; 
} 
else 
{ 
echo '-->'; 
echo $_POST['firstname']; 
} 
} 
?>

You can edit it like this......

for explame:

1.php

<?php
$a = '';
if(!isset($a)) echo "aaa";
else echo "bbb";
// result : bbb
?>

2.php

<?php
if(!isset($a)) echo "aaa";
else echo "bbb";
// result : aaa
?>

if you give a value that maybe space the tag of 'isset' would return ture.

Pardon my poor e...............

(如果你给一个变量赋值即时这个值是空的，isset也会返回TRUE；只有在没有对变量赋值的情况下isset才会返回FALSE)

TheDefender

When you use the POST method, the index name of "firstname" will always be set. It just won't have a value unless the form is filled in. You can verify this by using the print_r($_POST) function at the top of the script. It will print out all of your indexes and their associated values. Go ahead and try it and you should see what I mean.

In the case of using POST, you should actually check the value instead...

if(isset($_POST['submit'])) {
    if($_POST['firstname'] == "") {
        echo 'OMGZOR';
    } else {
        echo '-->';
        echo $_POST['firstname'];
    }
}
?>