Title: PHP Warning: Cannot modify header information Last modified: August 21, 2016 --- # PHP Warning: Cannot modify header information * Resolved [bamajr](https://wordpress.org/support/users/bamajr/) * (@bamajr) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/) * On every website where I’ve installed Easy Digital Downloads, I’m getting the following error, in the server error logs. * > 2/4/2014 2:42:25 AM – PHP Warning: Cannot modify header information – headers > already sent by (output started at /var/www/worldwidevillage.org/wp-includes/ > functions.php:2773) in /var/www/worldwidevillage.org/wp-content/plugins/easy- > digital-downloads/includes/libraries/class-wp-session.php on line 124 * and…. * > Feb 3 18:42:25 hvac.wsynth.net www: PHP Warning: Cannot modify header information– > headers already sent by (output started at /var/www/worldwidevillage.org/wp- > includes/functions.php:2773) in /var/www/worldwidevillage.org/wp-content/plugins/ > easy-digital-downloads/includes/libraries/class-wp-session.php on line 124 * and… * > 1/29/2014 5:33:30 PM – PHP Warning: Cannot modify header information – headers > already sent by (output started at /var/www/bamajr.com/wp-content/plugins/gravityformspicatcha/ > picatcha.php:1357) in /var/www/bamajr.com/wp-content/plugins/easy-digital-downloads/ > includes/libraries/class-wp-session.php on line 124 * please take a look at this. * [https://wordpress.org/plugins/easy-digital-downloads/](https://wordpress.org/plugins/easy-digital-downloads/) Viewing 15 replies - 1 through 15 (of 40 total) 1 [2](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/2/?output_format=md) [3](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/3/?output_format=md) [→](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/2/?output_format=md) * Moderator [Pippin Williamson](https://wordpress.org/support/users/mordauk/) * (@mordauk) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575191) * Can you post your Downloads > System Info for me? * Thread Starter [bamajr](https://wordpress.org/support/users/bamajr/) * (@bamajr) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575204) * ``` ### Begin System Info ### ## Please include this information when posting support requests ## Multisite: No SITE_URL: https://bamajr.com HOME_URL: http://bamajr.com EDD Version: 1.9.4 Upgraded From: None WordPress Version: 3.8.1 Permalink Structure: /%year%/%monthnum%/%day%/%postname%/ Active Theme: Genesis 2.0.2 Test Mode Enabled: Yes Ajax Enabled: Yes Guest Checkout Enabled: Yes Symlinks Enabled: No Checkout is: Valid Checkout Page: http://bamajr.com/checkout/ Success Page: http://bamajr.com/checkout/purchase-confirmation/ Failure Page: http://bamajr.com/checkout/transaction-failed/ Downloads slug: /downloads Taxes Enabled: No Taxes After Discounts: No Tax Rate: 0% Country / State Rates: Country: *, State: , Rate: | Registered Post Stati: publish, future, draft, pending, private, trash, auto-draft, inherit, closed, spam, orphan, hidden, refunded, failed, revoked, abandoned, active, inactive, preapproval, cancelled Platform: Apple Browser Name: Safari Browser Version: 7.0.1 User Agent String: Mozilla/5.0 (Macintosh; Intel Ma c OS X 10_9_1) AppleWebKit/537.7 3.11 (KHTML, like Gecko) Version /7.0.1 Safari/537.73.11 PHP Version: 5.3.10-1ubuntu3.7 MySQL Version: 5.1.73-0ubuntu0.10.04.1 Web Server Info: nginx/0.7.65 PHP Safe Mode: No PHP Memory Limit: 256M WordPress Memory Limit: 40MB PHP Upload Max Size: 8M PHP Post Max Size: 12M PHP Upload Max Filesize: 8M PHP Time Limit: 300 PHP Max Input Vars: 1000 WP_DEBUG: Disabled WP Table Prefix: Length: 3 Status: Acceptable Show On Front: posts Page On Front: (#0) Page For Posts: (#0) WP Remote Post: wp_remote_post() works Session: Enabled Session Name: PHPSESSID Cookie Path: / Save Path: /var/lib/php5 Use Cookies: On Use Only Cookies: On DISPLAY ERRORS: N/A FSOCKOPEN: Your server supports fsockopen. cURL: Your server supports cURL. SOAP Client: Your server has the SOAP Client enabled. SUHOSIN: Your server does not have SUHOSIN installed. TEMPLATES: ACTIVE PLUGINS: Akismet: 2.5.9 bbPress: 2.5.3 bbPress Genesis Extend: 1.0.2 Clicky for WordPress: 1.4.2.3 Conditional CAPTCHA for WordPress: 3.6 Easy Digital Downloads: 1.9.4 Easy Digital Downloads - Auto Register: 1.1 Easy Digital Downloads - Downloads As Services: 1.0.4 Easy Digital Downloads - Purchase Gravatars: 1.0 Easy Digital Downloads - Stripe Payment Gateway: 1.6.7 Genesis eNews Extended: 1.4.0 Genesis Latest Tweets: 1.2.2 Genesis Simple Edits: 1.7.1 Genesis Simple Hooks: 2.0.1 Google Analytics for WordPress: 4.3.4 Google Authenticator: 0.47 Gravity Forms: 1.8.3 Gravity Forms PayPal Add-On: 1.9 Gravity Forms Picatcha Add-On: 2.0 Gravity Forms Polls Add-On: 1.5 Gravity Forms Quiz Add-On: 1.1 Gravity Forms Survey Add-On: 1.0.1 Gravity Forms User Registration Add-On: 1.7 Landing Pages: 1.4.6 NextScripts: SNAP Pro Upgrade Helper: 1.1.8 NextScripts: Social Networks Auto-Poster: 3.2.1 Polldaddy Polls & Ratings: 2.0.21 SendPress: Email Marketing and Newsletters: 0.9.8.1 SendPress Pro: 0.8.1 SensorPress: 1.0 Simple Social Icons: 1.0.5 Simple URLs: 0.9.4 Stop Spammer Registrations Plugin: 5.5 Stop Spammer Widget: 5.5 Sucuri Security - SiteCheck Malware Scanner: 1.5.4 SyntaxHighlighter Evolved: 3.1.7 W3 Total Cache: 0.9.3 WordPress HTTPS: 3.3.6 WordPress SEO: 1.4.24 WordPress SEO News: 1.1.1 WP SlimStat: 3.5.3 ### End System Info ### ``` * _[Moderator Note: Please post log files between backticks or use the code button.]_ * Thread Starter [bamajr](https://wordpress.org/support/users/bamajr/) * (@bamajr) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575226) * [@moderator](https://wordpress.org/support/users/moderator/)… * Sorry… thought I did! * Moderator [Pippin Williamson](https://wordpress.org/support/users/mordauk/) * (@mordauk) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575283) * Does the notice only show in the logs or also on a page somewhere? * Thread Starter [bamajr](https://wordpress.org/support/users/bamajr/) * (@bamajr) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575284) * It’s only in the logs… which, I know, as a general rule, aren’t a huge issue, but these warnings started showing up when the website started crashing. The website is returning a 500 error, about 50 times per day (or more). Naturally, I’m going through all the logs, to figure this out, because, other than plugin updates, I haven’t added or removed any plugins, nor have I modified the theme/ design. * I started out by scanning the website, with Sucuri, and it gets a clean report! * Moderator [Pippin Williamson](https://wordpress.org/support/users/mordauk/) * (@mordauk) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575393) * Who’s the host? * Thread Starter [bamajr](https://wordpress.org/support/users/bamajr/) * (@bamajr) * [12 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575394) * websynthesis.com * Moderator [Pippin Williamson](https://wordpress.org/support/users/mordauk/) * (@mordauk) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575457) * Hmm, looks like I missed your last reply, sorry. * If you update to EDD 1.9.5, I bet the issue goes away. There was a bug in 1.9.4 and earlier that caused thousands of rows to get create in the wp_options table. * Go into your database and look at the wp_options table. Delete any and all rows that have a name that matches “wp_session”. * Thread Starter [bamajr](https://wordpress.org/support/users/bamajr/) * (@bamajr) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575458) * By “name” do you mean “option_name” and by “wp_session” to you mean “_wp_session” * [sadhaka](https://wordpress.org/support/users/sadhaka/) * (@sadhaka) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575481) * I have this same problem using version 1.9.6 * [psorensen](https://wordpress.org/support/users/psorensen/) * (@psorensen) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575482) * I just ran into this problem. I updated EDD and in MySQL ran the query * `delete from wp_options where option_name like '_wp_session%'` * The wildcard accounts for both `_wp_session` and `_wp_session_expires` * [sadhaka](https://wordpress.org/support/users/sadhaka/) * (@sadhaka) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575483) * Thousands of rows? Wouldn’t this be better handled by an update? * [psorensen](https://wordpress.org/support/users/psorensen/) * (@psorensen) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575484) * Perhaps. I’m just here letting you know that I ran into the same problem as you did, and a way to repair it so that the `wp_options` table is not so bloated ( mine was 250+ mb!). * Maybe Pippin will provide an update, but I’ll also bet he’s hesitant (from a liability perspective) to include script that deletes thousands on thousands of rows. * I’m not sure what to tell you. Do whatever you’re comfortable with. I’m only sharing what worked for me. Good luck. * [psorensen](https://wordpress.org/support/users/psorensen/) * (@psorensen) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575485) * Actually, after writing this post I see that 3568 rows that match ‘_wp_session’ have been created after removing them an hour ago. * Seems that the bug still exists. * [sadhaka](https://wordpress.org/support/users/sadhaka/) * (@sadhaka) * [12 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/#post-4575486) * Well, the update that should come to fix this should also delete the unnecessary database data. Viewing 15 replies - 1 through 15 (of 40 total) 1 [2](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/2/?output_format=md) [3](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/3/?output_format=md) [→](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/2/?output_format=md) The topic ‘PHP Warning: Cannot modify header information’ is closed to new replies. * ![](https://ps.w.org/easy-digital-downloads/assets/icon.svg?rev=3455837) * [Easy Digital Downloads – eCommerce Payments and Subscriptions made easy](https://wordpress.org/plugins/easy-digital-downloads/) * [Frequently Asked Questions](https://wordpress.org/plugins/easy-digital-downloads/#faq) * [Support Threads](https://wordpress.org/support/plugin/easy-digital-downloads/) * [Active Topics](https://wordpress.org/support/plugin/easy-digital-downloads/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/easy-digital-downloads/unresolved/) * [Reviews](https://wordpress.org/support/plugin/easy-digital-downloads/reviews/) ## Tags * [header information](https://wordpress.org/support/topic-tag/header-information/) * [PHP Warning](https://wordpress.org/support/topic-tag/php-warning/) * 40 replies * 7 participants * Last reply from: [Paulo Selke](https://wordpress.org/support/users/paulo-selke/) * Last activity: [11 years, 6 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-6/page/3/#post-4575549) * Status: resolved