Php5 send headers error header already sent

php5 send headers error header already sent

This is triggering the header() method, but becuase outputBody() in Abstract.php has already ran and echo'd content to the page the headers have been set. When PHP receives the first output (print, echo, ) it will flush all collected headers. Afterward it can send all the output it wants. “Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\heermatka\myprofile.php:48) in C:\xampp\.

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How to fix Headers already sent error in PHP - Cannot modify header information - HTTP headers

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PHP-5.6 reports "Cannot modify header information - headers already sent in ..." warnings #871

As for "output buffering", It might have been third-party documentation
referring to what you suggested below.

If I remember correctly, the only time I ever got those errors was when
Eclipse PDT was setting at a breakpoint and I inadvertently tried to log
in again outside the Eclipse environment.

Interesting about the expected locations of the php.ini file. In my
Fedora 21 distribution, the php.ini file is located in /etc/. But that
depends on how the package manager build the package for your
distribution. The default location is set at build time, as I found out
when I had to build PHP5.4 because the ampache documentation indicates
that it's the minimum version and Fedora no longer offers a version
prior to 5.6. Of course it ultimately depends on the command line
switch(-c) to specify the location and file name of the .ini file.

I too am curious as to what you might find concerning this problem.

73 From Ernie D

AA1AD

How to Fix the “Cannot Modify Header Information – Headers Already Sent By” Error

Most WordPress error messages give you an idea of what’s causing problems on your site. The “Warning: cannot modify header information – headers already sent by” error is no exception. If a PHP file cannot be executed due to a problem in its code, you’ll run into this message.

There are several potential causes for the “Cannot modify header information” error. Fortunately, the message itself will tell you which file is causing the problem. It even points to the line of code that contains the issue.

In this article, we’re going to discuss this error and its causes. Then, we’ll go over two ways that you can fix the problem. Let’s get to work!

What Causes the “Cannot Modify Header Information – Headers Already Sent By” Error

As we mentioned before, you’ll run into this error when one of your site’s .php files cannot be executed. WordPress relies on .php files, such as wp-config.php and functions.php, for its core functionality.

If there’s a problem within one of the .php files that your website needs to load, you’ll see an error message that looks like this:

Fortunately, the “Cannot modify header information” error provides a lot of information that makes troubleshooting relatively straightforward. The message will point you toward two files – the first one contains the problem, which prevents the second one from executing.

At the end of the error message, you’ll see a section that says “line XX.” It shows the location of the specific code that’s causing the problem.

Usually, the problem in the PHP code is pretty easy to fix. Some common causes that can trigger the error message include:

  • Whitespaces before the segment of the code or after the closing  tag
  • An HTML blockbefore the PHP header function
  • or statements added before the PHP header function
  • Problems with a plugin’s code

Fixing these types of errors requires you to be at least passingly comfortable with modifying PHP code. You won’t need to add any code yourself.

Still, you may need a bit of extra help identifying the problem. This is particularly true if the issue isn’t related to whitespaces or statements before the PHP header function.

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How To Troubleshoot the “Warning: Cannot Modify Header Information – Headers Already Sent By” Error (2 Methods)

There are two approaches to troubleshooting the “Cannot modify header information – headers already sent by” error. The first method doesn’t require you to exit the WordPress dashboard.

However, the second strategy uses FTP/SFTP if you can’t access the dashboard or use WordPress.

Let’s start with the first troubleshooting method.

1. Fix the Error With the Plugin/Theme Editor or Replace a Plugin

The first thing you need to do when you run into the “Cannot modify header information – headers already sent by” error is to open the file that’s causing the problem. Then, locate the line the message indicates.

For example, if you see an error that reads the following, it means you need to look inside your theme’s functions.php file:

In this scenario, you can reach the source of the problem using the WordPress theme editor. To access it, go to Appearance > Theme Editor.

Once you’re in, use the menu to the right to select the file you need to access.

Theme Functions (functions.php) in the theme editor

If you look closely, you’ll notice several whitespaces before the tag. The error message itself points toward line number one. Therefore, this tells you that the whitespaces are the sources of the problem.

In this example, all you have to do is remove the whitespaces and click on Update File. Now try reloading your website, and the error should be gone.

You can apply the same process using the WordPress plugin editor (Plugins > Plugin Editor). This method is applicable if the error message points toward a faulty plugin file.

Alternatively, you may run into an error that indicates one of the files within your WordPress plugins directory. In this scenario, you can remove and reinstall that plugin. In most cases, that will take care of the issue for you.

However, keep in mind that you might lose that plugin’s configuration, depending on which tool you use. As such, you may need to set up the add-on again.

2. Edit the Problem File via FTP/SFTP

In some cases, the source of the “Cannot modify header information – headers already sent by” error won’t lie in a file that you can access using the WordPress theme or plugin editors. Alternatively, you might be using a non-WordPress site.

In these scenarios, your best option is to access the problem file using FTP/SFTP. To do so, you’ll need to use an FTP or SFTP client such as the FileZilla platform.

You’ll also need access to your website’s FTP/SFTP credentials. In most cases, you should be able to find them within your hosting panel.

If you use Kinsta, you can access MyKinsta, select your website under Sites and click on its Info tab.

SFTP/SSH in MyKinsta

Once you have the credentials, use your FTP or SFTP client to connect to your website. You’ll need to locate the site’s root folder. Usually, its name should be root, public_html, public, or your own site’s name.

Here’s a quick look at what the inside of a WordPress root folder looks like.

A look at the WordPress root folder

Go ahead and locate the file that the “Cannot modify header information – headers already sent by” error indicates. For example, if the issue is , right-click on the file and select the View/Edit option.

Find the wp.config file in the root folder

That option will open the selected file using your default text editor. Once the document is open, locate the problem by navigating to the line the error message pointed you toward.

Navigate to the line of the error message

If you can’t spot the error, you might need to consult with someone who has experience working with PHP files. However, suppose you’re dealing with a whitespace issue or a statement before the PHP header. In that case, you should be able to fix the problem yourself.

Once you’re done, save the changes to the file and close the FTP/SFTP client. Try reaccessing your website, and the error should be gone.

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Summary

The “Warning: cannot modify header information – headers already sent by” error can be intimidating because it outputs a long message. However, that detailed error message makes this bug relatively simple to troubleshoot. Unlike other problems, this one is polite enough to tell you which file is causing it and which line of code you need to look into.

Depending on the file that’s causing the error, there are two ways that you can go about troubleshooting it:

  1. Fix the error using the plugin/theme editor or replace a plugin.
  2. Edit the problem file via an FTP/SFTP client.

Finding the source of this error is simple. However, fixing it can be a problem if you’re not familiar with PHP.

Still having issues fixing this error? Please share your experience with our community in the comments below!


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headers_sent() function

The headers_sent() function is an inbuilt function in PHP which is used to determines whether the header is successfully sent or not. The headers_sent() function returns True if header sent successfully and False otherwise.

Syntax: 

bool headers_sent( $file, $line )

Parameters: This function accepts two parameters as mentioned above and described below:  

  • $file: This parameter holds the filename. It is an optional parameter.
  • $line: This parameter holds the line number where output started. It is also optional parameter.

The headers_sent() function will put the PHP source file name and line number where output started in the file and line variables if the file and line parameters are set.

Return Value: This function returns True if headers has been sent and false otherwise.

Example 1:  

PHP

Output: 

In this example, no header is sent previously so !headers_sent() will be TRUE and then header(“Location:https://en.wikipedia.org/wiki/Main_Page”); will send the header information and as per the header it will redirect to the website that is in parameter.

Note: Header cannot be add once header block has been sent. So this function has implemented to avoid errors like. 

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd3/798/438108/public_html/gfg/header.php:1) in /storage/ssd3/798/438108/public_html/gfg/header.php on line 4

Example 2:  

PHP

 
 
 

Note: The example shown here will not run in online IDE as it doesn’t support redirecting and modifying headers. So, try to run it on hosting server or on localhost. 

Output: 

hello world

Warning:  

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd3/798/438108/public_html/gfg/header.php:4) in /storage/ssd3/798/438108/public_html/gfg/header.php on line 9

Warning: Cannot modify header information – headers already sent by 
(output started at /storage/ssd3/798/438108/public_html/gfg/header.php:4) 
in /storage/ssd3/798/438108/public_html/gfg/header.php on line 10
This error can be solved by using headers_sent() function. 

Example 3: After resolving the above error.  

PHP

Output:

hello world

Explanation: 
headers_sent() function checking whether header has already been sent or not. so !headers_sent() returns false for which header are not being sent again, avoiding the errors. 

NOTE: The example shown here will not run in online IDE as it doesn’t support redirecting and modifying headers. So, try in some hosting server or on localhost.

Example 4:  

PHP

 
 
 
 
 
 
 

Output: 

Reference:http://php.net/manual/en/function.headers-sent.php
 


My Personal Notesarrow_drop_up
CN87ug

-----Original Message-----From: pluser [email protected]
Reply-to: ampache/ampache <reply
+005d506eed819833e6197[email protected]reply.github.com>
To: ampache/ampache [email protected]
Cc: Ernest Wagner [email protected]
Subject: Re: [ampache] PHP-5.6 reports "Cannot modify header information

Thank you for your reply, @wagnered.

Did you say about "output_buffering"?
I tried to set several values (On/Off/4096) to the option, but nothing
changed.

Yeah. I thought so first. But according to the source code of ampache,
It seems to be considerd.

In my environment, Apache's mod_php uses php.ini
in /etc/php/apache2-php5.6 directory.
And lighttpd uses php.ini in /etc/php/cgi-php5.6 directory. Of course,
two files are exactly same.
However there are not low possibility to mistake settings in another
place.


Reply to this email directly or view it on GitHub.

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