help with my first exercise

rockdolfolk

Hi,
I'm just starting with PHP and the first exercise is this:

<HTML>
<FORM>
Ingresa tu nombre aquí:<BR>
<INPUT TYPE=TEXT NAME=username>
<BR><BR>
<INPUT TYPE=SUBMIT VALUE="Enviar data">
</FORM>
<BR><BR>
Escribiste:
<BR>
<?php
echo $username;
?>
</HTML>

In the book the example workd fine but I get this error:

Notice: Undefined variable: username in C:\Archivos de programa\Apache Group\Apache2\htdocs\R\PPHPP\pedir_nombre.php on line 11

As you see I'm using Apache with W2K.

Thanks

statusquo

try

<?php echo $_POST['username'] ?>

rockdolfolk

it doesn't work:

<?php
echo $_POST['username'];
?>

it gives this error:

Undefined index: username

mtmosier

try

<?php echo $_GET['username'] ?>

laserlight

<html>
<head>
<title>PHP Exercise</title>
</head>
<body>
<p><form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<input type="text" name="username" /><br />
<input type="submit" value="Enviar data" />
</form></p>
<?php
if (!empty($_POST['username'])) {
	echo '<p>Escribiste: ' . $_POST['username'] . '</p>';
}
?>
</body>
</html>

Basically, the action attribute in <form> is required and the form method defaults to get.
You need to check that incoming variables like $_POST['username'] exists by using [man]isset/man or [man]empty/man before using them.

rockdolfolk

Thanks. It works good!

rockdolfolk

The code you send works fine except for the first time:

<?php 
if (!empty($_POST['username'])) { 
    echo '<p>Escribiste: ' . $_POST['username'] . '</p>'; 
} 
?>

The first time I get this error:

Undefined index: username

The next times it goes good.

Is there any way to solve this problem?

laserlight

There should be no such problem if you are using the code I provided verbatim.

rockdolfolk

Sorry. I forgot to pass the first part.
Now it's OK.
Thanks.