Debugging in phpStorm and stream output

Question

PHP

Good day!

I'm trying to catch the annoying "Headers already sent by" using phpStorm.
Is there any way to output the STDOUT stream to the console or to variables?
I want to run through the debugger and find the place where the line break appears.

Answer 1

utf-8 + bom is often affected

Answer 2

Well, “Headers already sent by” tells you where they have already been sent. You just need to look carefully there. Well, if possible, insert die () there and see what is displayed there in all its glory. Most likely some kind of warning or error

Answer 3

you can try calling the script from the console, past the web server:
$ php /path/to/index.php

Answer 4

STDOUT can be buffered and passed the value of the buffer to a variable.
<?php
ob_start();
...code...
$out = ob_get_contents();
?>

Answer 5

Try xdebug, its error output should help.

Answer 6

the first line ob_start(callable<... function...>)
will catch everything, including fatal error