Can't log in to wp-admin after updating to wordpress 3.8 – Cookies error

@jameshurst, the issue is most likely not wp3.8, but more likely the server setup concerning MAMP localhost. There are a lot of possibilities when dealing with a localhost considering we are all using our personal computer. That fact alone bring in unlimited possible side effects.

Your cookies could be getting scrambled by a conflict between any of the following: php version, ports or document root. I’m not 100% on what kind of conflict, just spitballing here.

<u>My setup</u>
Ports:

• Apache: 8888
• MySql: 8889

PHP v5.4.4
Document Root: MAMP/Preferences/Apache

As far as I know my setup is the default setup. When I downloaded and setup MAMP I changed nothing in the preferences. The only issues I’ve had have been related to file permissions and I don’t think that is the case here.

Is that not a strange root?
Mine says:

PHP v.5.5.3 (cache –)
Doc Root: /Applications/MAMP/htdocs

Or could that be the error?

Yeah, not sure what the heck that doc root was or why I wrote that, maybe it was late at night…

Document Root: /Applications/MAMP/htdocs

LOL

Still no solution ??

I did find that one of my friends has some white space after the closing php tag in their functions.php. Also turn on WP_DEBUG from the wp-config.php on line 81 by setting it to true.

<?php
// my code goes here
?>

I did not find any white spaces but did change false into true.
Now I get the following massages trying to log on….
(cookie errror remaines the same)

Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in /Applications/MAMP/htdocs/wordpress/wp-includes/wp-db.php on line 1142

Warning: Cannot modify header information – headers already sent by (output started at /Applications/MAMP/htdocs/wordpress/wp-includes/wp-db.php:1142) in /Applications/MAMP/htdocs/wordpress/wp-login.php on line 415

Warning: Cannot modify header information – headers already sent by (output started at /Applications/MAMP/htdocs/wordpress/wp-includes/wp-db.php:1142) in /Applications/MAMP/htdocs/wordpress/wp-login.php on line 427

It looks like there is a file somewhere that is triggering the headers.

Try this to start:
– temporarily de-activate your plugins or temporarily remove them (do not delete them, just move them to a temp folder)
– revert your theme to to the 2014 theme

This should put you back to start with your installation.

Next,
– activate just the theme and see if that is your issue.
– if your good start activating one plugin at a time.

Alternate ideas
– If you’re running a theme that you’ve modified, try to install a clean version
– if you’ve modified your theme look for white space

Read the following post for more info on “header already sent”
– https://stackoverflow.com/questions/8028957/how-to-fix-headers-already-sent-error-in-php
– stackoverflow can be a good resource, especially when the stats are really high

stackoverflow can be a good resource

So can the WP codex.

Try reviewing Solving “headers already sent” warnings

ok…

Why or how come al the original wp-.php files don not end with a ‘ ?> ‘
Is that not necessary?

Not – a closing ?> is not necessary at the very end of a .php file. And it is often considered good practice to omit it in order to avoid these “headers already sent” messages.