Forums | MacLife

Pithecanthropus · 2009-08-16 1:12 pm

I am in the very rudimentary steps of learning PHP/MySQL and have run into a problem with cookies. First of all I am running all my PHP through MAMP, I have the feeling that might wind up being an important point here, but I could be wrong.

I am setting up a very basic page with a simple test cookie named 45 that expires in a week. Here is my code*:

Code:

<html>
    <head>
        <title>Cookies</title>
    </head>
    <body>
    <?php 
        setcookie('test', 45, time()+(60*60*24*7)); 
    ?>
    </body>
</html>

And this is the error message I get from Firefox and Safari.

Warning: Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/php_sandbox/cookies.php:6) in /Applications/MAMP/htdocs/php_sandbox/cookies.php on line 7

I can't figure out what's wrong. Can anyone help?

*some of you may recognize this from the Lynda.com training videos.

Booksley · 2009-08-16 2:25 pm

Code:

<?php 
    setcookie('test', 45, time()+(60*60*24*7)); 
?>
<html>
    <head>
        <title>Cookies</title>
    </head>
    <body>
    
    </body>
</html>

You need to send any headers before sending data, and cookies are part of the header. That's why you got that error message.

Pithecanthropus · 2009-08-16 3:27 pm

Ah ha!

Thanks.

Pithecanthropus · 2009-08-19 4:52 pm

I've run into the same problem again, but this time with a page redirect inside a form. We've filled out a small form and if we're successful we want it to redirect to a central page called "content.php".

Code:

<?php
    $menu_name = $_POST['menu_name'];
    $position = $_POST['position'];
    $visible = $_POST['visible'];
?>
<?php
    $query = "INSERT INTO subjects (
                menu_name, position, visible
            ) VALUES (
                '{$menu_name}', {$position}, {$visible}
            )";
    if (mysql_query($query, $connection)) {
        // Success!
        header("Location: content.php");
        exit;
    } else {
        // Display error message
        echo "<p>Subject creation failed.</p>";
        echo "<p>" . mysql_error() . "</p>";
    }
?>

So if I can't modify the header information, how am I supposed to do this? (Man, if I can't handle this beginner crap, how am I ever going to learn this stuff? mad )

sturner · 2009-08-19 6:12 pm

The following is a totally fatuous, and unhelpful reply

Magic

Basseq · 2009-08-19 7:54 pm

You're sending data to the page before calling header(). Find it.

Forums | MacLife

#1 2009-08-16 1:12 pm

More Learning: PHP Help

Code:

#2 2009-08-16 2:25 pm

Re: More Learning: PHP Help

Code:

#3 2009-08-16 3:27 pm

Re: More Learning: PHP Help

#4 2009-08-19 4:52 pm

Re: More Learning: PHP Help

Code:

#5 2009-08-19 6:12 pm

Re: More Learning: PHP Help

#6 2009-08-19 7:54 pm

Re: More Learning: PHP Help

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