Cannot Modify Header Information Headers Already Sent By On Hosting – One minute the code or project is working fine and then you add some code for a new feature, it starts showing errors in the previously working feature or code.
And if I’m right, you’re in the early stages of programming if you’re scared or worried after seeing such an error.
Cannot Modify Header Information Headers Already Sent By On Hosting
To fix any errors, this is what I and most programmers do when we encounter an error.
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You should be lucky to get errors as it helps improve your debugging and research skills, which are essential skills to become a senior developer.
To understand why headers should be sent before output, it is necessary to look at a typical HTTP response. PHP scripts primarily generate HTML content, but also pass a set of HTTP/CGI headers to the web server:
Headers PHP must first pass headers to the web server. He can only do this once. After the double line is broken he can never reform them again.
All headers collected. He can then send all the output he wants. But sending the next HTTP header is impossible.
Warning: Session_start(): Cannot Send Session Cache Limiter
Warning: Unable to modify header information – header already sent (output started at /www/usr2345/htdocs/auth.php:52) /www/usr2345/htdocs/index.php online at 100
The note “output started” in brackets is more important. This indicates the previous output source. In this example, it is auth.php and line 52. That’s where you wanted to find the premature output.
This error message is triggered when you send anything before sending the HTTP header (including the set cookie or header). Common reasons to output something before the HTTP headers are:
3. Warning output by php, if display_errors php.ini property is set. Instead of crashing on a programmer’s mistake, php silently resolves the error and issues a warning. Although you can adjust the display_errors or error_reporting configuration, it is better to fix the problem.
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Common causes are accessing undefined elements of an array (such as $_POST[‘input’] without using null or iset to check if input is set, or using an undefined constant instead of a string literal (as in $_POST[)input], note the missing quotes. ).
All output after calling ob_start is buffered in memory until you free the buffer, e.g. with ob_end_flush .
However, while avoiding output buffering issues, you should determine why your application is outputting the HTTP body before the HTTP header. It would be like taking a phone call and discussing your day and the weather before telling the caller they got the wrong number. The content is free. We earn a commission when you make purchases on our site through referral links. Learn more
This is a common WordPress error and is one of the few WordPress errors that offers details that can be used to remove it from your site.
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In this article, we’ll show you how to read the error to find out what’s causing it, and then show you the steps you need to take to remove it from your WordPress site.
The error is caused by faulty code in your page header. This is triggered by:
To fix the “Warning header information cannot be modified” error, you must first find the exact cause of the error and then proceed to fix the corrupted file.
You can find the exact cause of the error by reading the text of the error message. For example, we encountered the following error on our demo website:
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💡 IMPORTANT: Before we proceed, know that the error will look very different on your website. On our demo site, the error was caused by a plugin called Redirect, but on your site, the error may be caused by a different plugin. Or it could be caused by the theme or core WordPress files. Please know that despite the difference in its source, the structure of the error remains the same.
So in the next paragraph, we’re going to break down the structure of the error and show you how to read it.
Part 1 is the name of the error. Part 2 details the file that is causing the error and needs to be fixed. And Part 3 shows a file that cannot work properly due to a broken file in Part 2.
Our focus should be on part 2, as it is the source of the error. Let’s break it down to improve our understanding of it:
Php Warning: Cannot Modify Header Information
Do you see how it shows the true reason for the error? Next, you will learn how to fix the error.
There are two ways to fix “Cannot modify warning header information” error on your WordPress site. Let’s look at each answer.
Before you proceed, please back up your entire website. In the following tutorial, you will be asked to change and edit your WordPress files. And these activities are known to break websites. Your safety net will be a backup when things go wrong. So make sure you have a backup before proceeding.
In Step 1 we showed you how to find the cause of the error. So by now, you should know which software is causing the error on your website.
If the error persists, download a fresh copy of the software and install it on your website. The previous copy will be automatically replaced with the new one. Make sure you have installed the same software version.
If you cannot access your WordPress admin, you need to go to the backend of your website to change the software.
The backend of your website can be accessed from your cPanel hosting account or an FTP client like Filezilla. We will show you how to use cPanel. If you prefer to use an FTP client, we have a separate FTP guide on that.
To access cPanel open your hosting account and select cPanel. The location of cPanel will vary from host to host. Check your host’s support documentation to find cPanel.
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In the wp-content folder, you’ll find folders containing plugins and themes installed on your website. Open the Plugins or Themes folder depending on which software you plan to replace.
Now you will need to download a fresh copy of the plugin or theme to your local computer. Premium plugins and themes are purchased from the software’s official marketplace or website. Free plugins can be found here and free themes can be found here.
Then go to the Plugins or Themes folder on the file manager and upload the software to the folder.
At this point, your hosting provider will warn you that you are trying to upload an existing file. Avoid the warning by selecting the OK or Replace button.
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To replace WordPress core, you have to take separate steps and reinstall WordPress manually.
Once done, visit your website and check if the “Unable to modify notification header information” error is gone.
💡 IMPORTANT: Still seeing the error? Sometimes, the website still shows errors after the caching has finished. Before you try the next solution, make sure you clear your cache and check it again.
Back in Step 1, we showed you how to identify the file causing the error. You can use that information to edit the file and repair it.
Error Warning: Cannot Modify Header Information
For example, on our demo site, we know that the problem originates from a file called “redirection-settings.php” located in the redirection plugin folder. We know that line number 3 in that file is causing the error.
Likewise, identify the file causing the error on your website and then open the file through a file manager or FTP client.
We used a file manager to open the offending file on our demo site. All we had to do was right click on the file and select the edit button.
One must be technically savvy to find errors in a WordPress file. So it’s totally fine if you can’t see the problem with your delinquency file.
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Take a screenshot of the file and the error, contact the plugin or theme developer and ask for help. If the error is caused by a WordPress core file, please leave a comment in the WordPress Support Forum. Make sure you don’t reveal your website name or URL to avoid security risks.
“Unable to modify header information warning” is a common WordPress error and like other WordPress errors, it tells us what caused the error to appear on the site.
The solution involves either replacing the offending software with a new copy or going to the backend of the website to edit the offending file. Needless to say, editing WordPress files is risky and a backup should be taken before proceeding with such steps.
For some other tips on troubleshooting WordPress errors, you can also check out our general guide 👉 WordPress Troubleshooting.
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