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Day 69 – Warning: Cannot modify header information – headers already sent by

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Had a great deal of shock just now when i was trying to log into this account for wordpress. And i receive this msg Warning: Cannot modify header information – headers already sent by. I tried with wp-login.php which failed and wp-admin which failed too.


Not matter what method i choose, the error message with the different header will appear. According to http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F

It states that the problem is due to additional spaces or commands after “?>” command, “?>” command is supposed to be the last line in a php file. And any characters or lines after this, will cause problems.


Luckily for me, with my tiny little bit of programming skill, i source through my files in file manger and saw spaces and a weird command with a javascript popup after “?>” in pluggable.php


My solution

It was a popup to a website with the keyword “Pshao” in the url. I recalled that it was a photo blog. I delete the command and forgot to paste it in here, in my anxiety to solve this “Warning: Cannot modify header information – headers already sent by” problem.


Just take note, check through pluggable.php, wp-login.php, wp-admin.php and remove any spaces and commands after “?>” Clearing the spaces and rows will solve this login problems for wordpress.


It is not 100% foolproof for the above method. But i have discovered a 90% workabout to solve this problem and this allows me to log in to my dashboard.

  1. go to domain.com/wp-login.php and enter your username and password
  2. After typing the correct login details, you should either have an error Warning: Cannot modify header information  or
  3. If the message appear, your wordpress should already have register a cookie on your computer stating you are login.
  4. Type domain.com/wp-admin You should be sent to the dashboard


For an update, 1 site is up today and i am falling back on schedule with 2 more sites to finish by tomorrow!

Related posts:

  1. Day 64 – Wordpress Wp admin error and merry xmas
  2. Adsense Daily Challenge Day 47 – Spurred by Friend and Fast Wordpress Setup
  3. Adsense Daily Challenge Day 30 – Wordpress Problems
  4. Adsense Daily Challenge Day 48 – Wordpress Setup Again
  5. Day 96 97 – RSS Bot Upgrade

This entry was posted on Thursday, December 31st, 2009 at 5:16 am and is filed under Daily Challenge. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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