Php warning headers and client

Solve «Cannot modify header information — headers already sent by *.php»

Warning: Cannot modify header information — headers already sent by somefile.php (output started at somefile.php:###) in somefile.php on line ###

This Warning is shown by PHP when you use the header function to output headers or use the setcookie function to set cookies after any echo or content which is not inside PHP tag. Hello World . Both should throw this warning. You can disable this warning by turning the error_reporting to OFF using error_reporting ( 0 ); , which is pretty much the not way of doing things. In HTTP Headers are sent before the actual content so if you are going to use header function after outputting the contents, it is likely to not work.

How do I solve this Warning Cannot Modify Header Information ?

In order to solve this issue you have to make sure you dont echo or print any output before using header or setcookie function. Make sure the control passes through these functions and then to the output part.

I am sure I dont output anything before calling header or setcookie

Just see all your files for white spaces or empty new lines. For example if you include a file before using the header or setcookie functions, make sure the file does not have a closing php tag (?>) at the end of the file. This is recommended by PHP so that stray white space or new line characters at the end of this included file gets outputted. // <-- A new line on top ! Oops. // <-- A blank line at the end?

I still want to output first and then use header function

In that case you can use output buffering functions to buffer your output automatically before senting any output and the output is sent as a chunk at the end. The following code snippet shows this : Hello World . Again .

But my code is already done and I dont want to add ob_* functions to it !

You can turn on buffering in PHP on by default using php.ini. Look for output_buffering , The following shows the mentioned part of the php.ini file. Set the value as On and restart Apache server. ; Output buffering allows you to send header lines (including cookies) even ; after you send body content, at the price of slowing PHP’s output layer a ; bit. You can enable output buffering during runtime by calling the output ; buffering functions. You can also enable output buffering for all files by ; setting this directive to On. If you wish to limit the size of the buffer ; to a certain size — you can use a maximum number of bytes instead of ‘On’, as ; a value for this directive (e.g., output_buffering=4096). output_buffering = On

Video to fix your warning cannot modify header information

You know what would be a GREAT idea ? Simply to post a sample code using headers that works. I went through all these convoluted posts and am not better. Actually quite confused. This page is a list of code that does not work, and I still do not understand where ob_start should be placed . Sorry to be blunt, but teaching by example is often much better than cryptic dialogs and answers. Will appreciate a written example code, indeed. Thank you in advance.

For me the eror was consistenr until I removed BOM formatting. You can easy doit with Notepad++ on Encoding menu choose encode Utf8 without BOM and save Good luck

Hello, I need help please. I add ob_start() and that stops the warning. However, my javascript function stops working as well. Basically, I need to use header() to export data to an csv file. Everything was okay until I add this css stuff to help freeze while getting the data and unfreeze the webpage before the File Open/Save dialog pops up. The problem is that my program can freeze the webpage but cannot execute the js function to unfreeze the webpage. Please help out. Thanks in advance. Below is the essential part of the task: (I tried to make it as short as possible.)

' ; /*send data to an excel file*/ header ( "Content-type: application/csv" ); header ( "Content-Disposition: attachment; filename= $filename " ); echo $data ; > //END post IF ob_flush (); ?>

ob_start does not affect javascript

ob_start and ob_flush is most likely to not cause any issues on javascript, please check console for any likely javascript errors. I think you have missed an ending script tag after the unFreezeScreen definition.

Hi digitalpbk, Thanks for your response. I think I did have the ending tag ">" if that is what you meant. function unFreezeScreen() var outerPane = document.getElementById("FreezePane");
outerPane.className = "FreezePaneOff";
> The js script above didn't run after I added ob_start(). If I take off the ob_start then it runs but I also get the header warning errors.

Script ending missing

Thank you! One of the plugins uses setcookie, and I put ob_start / ob_end_flush to no avail. I fixed my php.ini for output buffering and finally it does the job!

hello..i got the same problem..had tried all the option here..noting work..this the error = Warning: ini_set() has been disabled for security reasons in /www/zymichost.com/n/i/k/nikstore/htdocs/install/index.php on line 2 Warning: Cannot modify header information - headers already sent by (output started at /www/zymichost.com/n/i/k/nikstore/htdocs/install/index.php:2) in /www/zymichost.com/n/i/k/nikstore/htdocs/system/engine/controller.php on line 28 Warning: Cannot modify header information - headers already sent by (output started at /www/zymichost.com/n/i/k/nikstore/htdocs/install/index.php:2) in /www/zymichost.com/n/i/k/nikstore/htdocs/system/engine/controller.php on line 29 And this my code. registry = $registry ; > public function __get ( $key ) < return $this ->registry -> get ( $key ); > public function __set ( $key , $value ) < $this ->registry -> set ( $key , $value ); > protected function forward ( $route , $args = array ()) < return new Action ( $route , $args ); >protected function redirect ( $url , $status = 302 ) < header ( 'Status: ' . $status ); header ( 'Location: ' . str_replace ( '&' , '&' , $url )); exit (); >protected function getChild ( $child , $args = array ()) < $action = new Action ( $child , $args ); $file = $action ->getFile (); $class = $action -> getClass (); $method = $action -> getMethod (); if ( file_exists ( $file )) < require_once ( $file ); $controller = new $class ( $this ->registry ); $controller -> $method ( $args ); return $controller -> output ; > else < trigger_error ( 'Error: Could not load controller ' . $child . '!' ); exit (); >> protected function render () < foreach ( $this ->children as $child ) < $this ->data [ basename ( $child )] = $this -> getChild ( $child ); > if ( file_exists ( DIR_TEMPLATE . $this -> template )) < extract ( $this ->data ); ob_start (); require ( DIR_TEMPLATE . $this -> template ); $this -> output = ob_get_contents (); ob_end_clean (); return $this -> output ; > else < trigger_error ( 'Error: Could not load template ' . DIR_TEMPLATE . $this ->template . '!' ); exit (); > > > ob_end_flush (); ?> any suggestion plez.

Check index.php for output statements

Please check the file at /www/zymichost.com/n/i/k/nikstore/htdocs/install/index.php:2 And add ob_start() ob_end_flush() to the index.php

My problem was solved when i used put all php code in a single php tag it means when we use some code
?>
any html coding
some code
?> then it was giving error
but i have copied all code in single php tag and really my problem was solved

Hello, I have this report in my server's error_log: Could not set cookie. Headers already sent. My header.php starts like this: window.fbAsyncInit = function() < FB.init(', status: true, cookie: true, xfbml: true>); and as for the index.php that is the file that starts the whole thing it starts like this: $app_id , 'secret' => $fb_app_secret , 'cookie' => true , Any Suggestions? Thank you very much in advance.

here is the code. this is showing warning:header already sent..i have used ob_start() and ob_end_flush() in this code..still it's giving the warning.. ob_flush (); ?> this error can occur Cannot modify header information - headers already sent by (output started at /home/rajashiv/public_html/data.php:2) in /home/rajashiv/public_html/data.php on line 9

Space before

php to stream mp3s

I was using a code to substitute the url adress with an id to stream mp3s. Adding ob_ functions fixed the problem for me.
Thank you for the solution by the way.

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DirectAdmin: Headers and client library minor version mismatch

Lately, one of our customers updated MySQL and rebuild PHP via custombuild. However, his website shows DirectAdmin: Headers and client library minor version mismatch.

As part of our Server Management Services, we assist our customers with several DirectAdmin queries.

Today, let us see how to solve this particular error.

DirectAdmin: Headers and client library minor version mismatch

Warning: mysql_connect() [function.mysql-connect]: /Headers and client library minor version mismatch/. /Headers:50157 Library:50511/

Here, PHP compiles with MySQL lower version, but it links a MySQL library of higher version family. This is the major cause of this error.

The root reason for this error is that PHP separates itself from the MySQL client libraries.

Hence, what happens (mainly on older compiles of Linux) is that people will compile PHP against a given build of the MySQL Client (an irrelevant version of MySQL) and not upgrade (in CentOS this package is mysqlclientXX).

In addition, this allows the package maintainer to support lower versions of MySQL.

Though a messy way to perform the task, it is the only way given how PHP and MySQL use different licensing.

In order to solve this, initially, we have to upgrade PHP to a version that complies with MySQL API library version or revert back mysql client libraries to API header version.

To do so, perform a cleanup in custombuild and rebuild PHP

# cd /usr/local/DirectAdmin/custombuild # ./build clean # ./build php

The MySQLND solves the problem with the help of PHP’s own native driver (the ND), which does not rely on the MySQL Client.

It also complies with the version of PHP we use. This is a better solution all around. If for no other reason MySQLND is made to have PHP talk to MySQL.

We can install mysqlnd using the command:

sudo yum install php-mysqlnd

[Failed to resolve the error? We’d be happy to assist]

Conclusion

In short, this error can occur even after MySQL update and PHP rebuild via custombuild. Today, we saw an effective method our Support Techs employ in order to solve this error.

PREVENT YOUR SERVER FROM CRASHING!

Never again lose customers to poor server speed! Let us help you.

Our server experts will monitor & maintain your server 24/7 so that it remains lightning fast and secure.

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mysqli(): Headers and client library minor version mismatch. Headers:50556 Library:100034

преамбула такая. есть у меня сервер, centos 7. есть сайт, достаточно навороченный движок, но все функционирует без проблем.

давече мой родственник попросил похостится на халяву, не откажеш же. да и вроде движок у него не сложный написан. вобщем поставил и сразу на его скрипты плезла ругань

2018/04/19 03:39:57 [error] 30968#30968: *15556 FastCGI sent in stderr: "PHP message: PHP Warning: mysqli::mysqli(): Headers and client library minor version mismatch. Headers:50556 Library:100034 in /var/www/server.xx/system/library/db/mysqli.php on line 7" while reading response header from upstream, client: ip_address, server: server.xx, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "server.xx" 

в одном месте гугл говорит что надо инсталить php5-mysqlnd, но у меня стоит

# yum list installed|grep php php56w-cli.x86_64 5.6.33-1.w7 @webtatic php56w-common.x86_64 5.6.33-1.w7 @webtatic php56w-fpm.x86_64 5.6.33-1.w7 @webtatic php56w-gd.x86_64 5.6.33-1.w7 @webtatic php56w-mbstring.x86_64 5.6.33-1.w7 @webtatic php56w-mcrypt.x86_64 5.6.33-1.w7 @webtatic php56w-mysql.x86_64 5.6.33-1.w7 @webtatic php56w-opcache.x86_64 5.6.33-1.w7 @webtatic php56w-pdo.x86_64 5.6.33-1.w7 @webtatic php56w-pear.noarch 1:1.10.4-1.w7 @webtatic php56w-pecl-apcu.x86_64 4.0.11-2.w7 @webtatic php56w-process.x86_64 5.6.33-1.w7 @webtatic php56w-soap.x86_64 5.6.33-1.w7 @webtatic php56w-xml.x86_64 5.6.33-1.w7 @webtatic 

в другом месте гугл требует уравнять версии хеадеров и библиотек.

]# php -i |grep 'Client API' Client API library version => 10.0.34-MariaDB Client API header version => 5.5.56-MariaDB 

куда двигаться, подскажите.

зы. сразу говорю, yum update делаю регулятерно

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