php cookies

Printable View

07-07-2011, 08:41 AM
keyboard

php cookies

Hi everyone,

I have been fidling with php cookies and came up with this

PHP Code:

<?php if(isset($_COOKIE['authorization'])) header('location: index.php'); else ?> <?php $cheese = $_POST['name']; $inTwoMonths = 60 * 60 * 24 * 60 + time(); setcookie('lastVisit',$cheese, $inTwoMonths); ?> <html> <head> <meta http-equiv="Refresh" content="3;url=http://randomhelp4you.heliohost.org/indexthesecond.php" /> </head> <body> <center> <p><font size="+2">Thankyou, you will be redirected shortly</font></p> <p>If you are not redirected, please click <a href="http://randomhelp4you.heliohost.org/indexthesecond.php">here</a>.</p> </center> </body> </html>

The idea behind it is to gather input from a form and save that input as a cookie. However I also wanted to make sure that they are coming from the page that has the form on it. If not they are redirected to a different page. It comes up with an error. Is it because I have two cookie thingys on one page. Any help would be appreciated
07-07-2011, 09:22 AM
JoeDaStudd

Without seeing the exact error its hard to say.

Try this.

PHP Code:

<?php if(isset($_COOKIE['authorization'])) header('location: index.php'); else{ $cheese = $_POST['name']; $inTwoMonths = 60 * 60 * 24 * 60 + time(); setcookie('lastVisit',$cheese, $inTwoMonths); ?> <html> <head> <meta http-equiv="Refresh" content="3;url=http://randomhelp4you.heliohost.org/indexthesecond.php" /> </head> <body> <center> <p><font size="+2">Thankyou, you will be redirected shortly</font></p> <p>If you are not redirected, please click <a href="http://randomhelp4you.heliohost.org/indexthesecond.php">here</a>.</p> </center> </body> </html> <?php } ?>

You might also want some validation against the $_POST['name'].
07-07-2011, 08:17 PM
traq

Your question is unclear.
Please provide more information, and be as specific as possible. What do you want to accomplish? What have you already tried? What problems did you encounter?
Also, please be sure that you have included all relevant code and/or a link to the page in question.

Please post the content of the error you are receiving.

If there is any other code which affects this script, please post that as well (for example, you're trying to check for a cookie named "authorization," but you don't show the code that sets that cookie. Your html form is missing as well).

I have no idea what you mean by "cookie thingys" (which, BTW, should be spelled thingies).

Is this the same code you were trying to develop in your other thread?
If so, you should post there; it helps keep things organized and will get you a better-informed response.
07-09-2011, 12:39 AM
keyboard

The first page of my website is this

PHP Code:

<?php if(isset($_COOKIE['lastVisit']))     header('location: indexthesecond.php'); else     $visit = $_COOKIE['lastVisit']; ?> <html> <head> <title>Randomhelp4you</title> <?php file_put_contents('ips.log', $_SERVER['REMOTE_ADDR'] . "\n", FILE_APPEND); ?> <?php $george = 60 * 60  + time(); setcookie('Authorization','no', $george); ?> <body style="background-color:lightblue"> </head> <body> <form action="setcookie.php" method="post"> Name <input name="name" type="text" maxlength="10" /> <input type="submit"/> </form> </body> </html>

The second page looks like this

PHP Code:

<?php if(isset($_COOKIE['authorization']))     header('location: index.php'); else      ?> <?php $cheese = $_POST['name']; $inTwoMonths = 60 * 60 * 24 * 60 + time(); setcookie('lastVisit',$cheese, $inTwoMonths); ?> <html> <head> <meta http-equiv="Refresh" content="3;url=http://randomhelp4you.heliohost.org/indexthesecond.php" /> </head> <body> <center> <p><font size="+2">Thankyou, you will be redirected shortly</font></p> <p>If you are not redirected, please click <a href="http://randomhelp4you.heliohost.org/indexthesecond.php">here</a>.</p> </center> </body> </html>

and the third page looks like this

PHP Code:

<?php if(isset($_COOKIE['lastVisit']))     $visit = $_COOKIE['lastVisit']; else     header('location: index.php'); ?> <html> <head> <link rel="stylesheet" type="text/css" href="basic.css" /> <title>Randomhelp4you</title> </script> <body style="background-color:lightblue"> </head> <body> <h1><center>Randomhelp4you</center></h1> <?php echo "Hey ". $visit; ?> </body> </html>

The idea behind it is that the go onto he index page (php) and enter their name. This form is procesed by setcookie.php . This page sets a cookie with their name on it, then redirects them to indexthesecond.php , were it displays their name. If they try to acess indexthesecond.php without the cookie, they should be redirected to index.php . If they try to go onto index.php with the cookie then they are redirected to indexthesecond.php . This all works fine but I am trying to add in an extra cookie with a 60 minute timeout which is assigned by index.php . This is to make sure that when they go to setcookie.php they came from index.php . I'm trying to explain this easily but if it dosen't make sense just tell me.
07-09-2011, 12:41 AM
keyboard

The error on index.php is

Warning: Cannot modify header information - headers already sent by (output started at /home1/keyboard/public_html/index.php:12) in /home1/keyboard/public_html/index.php on line 18

The error on setcookie.php is

Warning: Cannot modify header information - headers already sent by (output started at /home1/keyboard/public_html/setcookie.php:9) in /home1/keyboard/public_html/setcookie.php on line 12

By the way i did try the code that joedastudd posted (thankyou) but I could still acess the setcookie.php page without the cookie set by index.php.
Also joedastudd suggested that I add validation against $_POST['name']. I have no idea how to do this. Could anyone give me some tips please.
07-09-2011, 02:44 AM
bluewalrus

Is this line 12

PHP Code:

header('location: indexthesecond.php');

If so what are lines 1-10 you can't output any content before you use the header.
07-09-2011, 05:03 AM
traq

also,

PHP Code:

$_COOKIE['Authorization'] // and $_COOKIE['authorization'] // are _not_ the same cookies
07-09-2011, 06:46 AM
keyboard

Blue walrus, Which page were you reffering to the first second or third. I'm sorry but i don't what the error is that you are pointing out. Could you please try to explain what you meant to me. Thankyou everyone who has helped. Also Traq, I changed the a to an A.
07-09-2011, 06:15 PM
bluewalrus

Quote:

The error on index.php is

Warning: Cannot modify header information - headers already sent by (output started at /home1/keyboard/public_html/index.php:12) in /home1/keyboard/public_html/index.php on line 18

The error on setcookie.php is

Warning: Cannot modify header information - headers already sent by (output started at /home1/keyboard/public_html/setcookie.php:9) in /home1/keyboard/public_html/setcookie.php on line 12

The "Cannot modify header information - headers already sent by" means some content has already been outputted so the header can not be used.

For example

Valid:

Code:

<?php if(isset($_COOKIE['lastVisit'])) header('location: indexthesecond.php'); else $visit = $_COOKIE['lastVisit']; ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Untitled Document</title> </head> <body> </body> </html>

Invalid:

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <?php if(isset($_COOKIE['lastVisit'])) header('location: indexthesecond.php'); else $visit = $_COOKIE['lastVisit']; ?> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Untitled Document</title> </head> <body> </body> </html>

Valid:

Code:

<?php if(isset($_COOKIE['lastVisit'])) header('location: indexthesecond.php'); else $visit = $_COOKIE['lastVisit']; $content = "Blah"; echo $content; ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Untitled Document</title> </head> <body> </body> </html>

Invalid

Code:

<?php $content = "Blah"; echo $content; if(isset($_COOKIE['lastVisit'])) header('location: indexthesecond.php'); else $visit = $_COOKIE['lastVisit']; ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Untitled Document</title> </head> <body> </body> </html>

This also goes with including files if the file included outputs something it will error the header as well.

Also, do you mean you changed the a to an A in all other instances or here

Quote:

setcookie('Authorization','no', $george);

?
07-10-2011, 09:33 AM
keyboard

I'm sorry, I don't understand. What is the difference between your examples of valid and invalid. Thankyou for helping.
07-10-2011, 09:40 AM
bluewalrus

In the valid everything being outputted to the browser is outputted after the header declaration. In the invalids things are being outputted before the header declaration. If you provide your full code we can be more specific, you can censor out secure parts with '****'.
07-10-2011, 05:14 PM
traq

perhaps a little clarification on how webpages are served.

The headers come first in the server response. after they're done, there is a blank line, and then the content of the webpage follows (which the browser renders). For example:

Code:

HTTP/1.1 200 OK Date: Mon, 23 May 2005 22:38:34 GMT Server: Apache/1.3.3.7 (Unix) (Red-Hat/Linux) Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT Etag: "3f80f-1b6-3e1cb03b" Accept-Ranges: bytes Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <meta name="generator" content="vBulletin 3.8.1" /> <meta name="keywords" content=" php cookies, dhtml, javascript, css, dynamic html, xml, html, php, cgi" /> <meta name="description" content="Page 2- php cookies PHP" /> <link rel="shortcut icon" href="favicon.ico" /> 

in this example, the last header is the content-type header. the blank line below signals the end of the headers, and the following line (in this case, with the doctype) is the first line of content.

once php outputs anything that is not a header (e.g., text, error messages, html markup, even whitespace or html comments), then the headers end on no more headers can be sent. When you try to use a function that sets headers (like header() or setcookie()) after content has been output, you get the "...headers already sent" error, because you can't "back up" and serve another header after that section of the server response is complete.
07-14-2011, 07:54 AM
keyboard

I have a different question but on the same cookie. This code

PHP Code:

<?php $george = 60 * 60 + time(); setcookie('Authorization','no', $george); ?>

I tried to set the timeout to 60 minutes. Did I get it right?
07-14-2011, 03:08 PM
traq

yup.
just think: seconds,minutes,hours,days, ...etc

PHP Code:

60 /*seconds*/ * 60 /*minutes*/ * 24 /*hours*/ * 365 /*days*/
07-18-2011, 01:26 AM
keyboard

I have 1 more question

for this code

PHP Code:

<?php if(isset($_COOKIE['Authorization'])) $cheese = $_POST['name']; $inTwoMonths = 60 * 60 * 24 * 60 + time(); setcookie('lastVisit',$cheese, $inTwoMonths); else header('location: index.php'); ?>

it comes up with this error
Parse error: syntax error, unexpected T_ELSE in /home1/keyboard/public_html/setcookie.php on line 6

I don't understand what i've done wrong any help would be appreciated
07-18-2011, 01:58 AM
bluewalrus

You need curly braces if your conditional is more than 1 line

PHP Code:

<?php if(isset($_COOKIE['Authorization'])) { $cheese = $_POST['name']; $inTwoMonths = 60 * 60 * 24 * 60 + time(); setcookie('lastVisit',$cheese, $inTwoMonths); } else header('location: index.php'); ?>

This would also work.

PHP Code:

<?php if(isset($_COOKIE['Authorization'])) { $cheese = $_POST['name']; $inTwoMonths = 60 * 60 * 24 * 60 + time(); setcookie('lastVisit',$cheese, $inTwoMonths); } else { header('location: index.php'); } ?>

The curly braces aren't necessary if what the conditional controls is only one line.
07-18-2011, 02:31 AM
keyboard

Thanks, it now works perfectly. How can I set this thread to resolved
07-18-2011, 03:26 AM
bluewalrus

Go to your first post (http://www.dynamicdrive.com/forums/s...26&postcount=1), click edit, click go advanced, add the resolved prefix to the thread title, and you should be all set.
07-18-2011, 04:26 AM
traq

Quote:

Originally Posted by bluewalrus

The curly braces aren't necessary if what the conditional controls is only one line.

Still, I always use them (and recommend the same to everyone).
07-18-2011, 05:46 AM
keyboard

I clicked on the link but there is no edit option, there is for my other posts and yes, i am logged in.
07-18-2011, 02:36 PM
bluewalrus

Sometimes it doesn't allow you to edit it, I'm not sure why but have gotten that before...