Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in

[mhejini]

Hi ,
i have this error in my project

Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php on line 428. in /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/ErrorHandler.php(135): yii\web\Response->send() #2 /home/es/domains/es/public_html/vendor/yiisoft/yii2/base/ErrorHandler.php(262): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException)) #3 [internal function]: yii\base\ErrorHandler->handleFatalError() #4 {main} thrown in /home/es/domains/es/public_html/vendor/yiisoft/yii2/web/Response.php on line 366

first time Yii2 version was 2.0.25, i updated that to 2.0.26 but this problem stayed that,
again i changed that to 2.0.23 but not solved, php version is 7.3.7
this project dont have any problem in local server but have just problem in host server
and some times dont have error but more times have error
below error is exist in host server too
(https://user-images.githubusercontent.com/18082695/64474404-cf4a7980-d189-11e9-9732-94457eec7c92.jpeg)

please help me ,
thank you

[samdark]

Such behavior is there since 2.0.14. Prior to that version in case there was output started, headers were silently not sent resulting in hard to debug issues.

In your case fix your php.ini first then check if error is still there.

[yii-bot]

Thank you for your question.
In order for this issue tracker to be effective, it should only contain bug reports and feature requests.

We advise you to use our community driven resources:

• The support forum
• The IRC chat room
• Slack
• The Definitive Guide to Yii

If you are confident that there is a bug in the framework, feel free to provide information on how to reproduce it. This issue will be closed for now.

This is an automated comment, triggered by adding the label question.

[mhejini]

Such behavior is there since 2.0.14. Prior to that version in case there was output started, headers were silently not sent resulting in hard to debug issues.

In your case fix your php.ini first then check if error is still there.

thanks for your reply
yes i told to the supporter that solving this problem , they told me that mysql.so dont supporting with php 7.3!!
how can i solve this problem mysql.so in php 7.3.7?

[samdark]

You don't need mysql.so at all. Yii does not use it so remove it from php.ini.

[mhejini]

You don't need mysql.so at all. Yii does not use it so remove it from php.ini.

thank you so much
Solved.