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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.lang.php
Subject: Re: [docker] error_log() not write inside web page
Date: Tue, 29 Nov 2022 21:20:13 +0100
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SupaPlex, 2022-11-26 21:30:

[...]
> <?php
> echo "BEFORE\n";
> error_log("abc");
> echo "AFTER\n";
[...]
> supaplex$ curl http://localhost:8013/
> BEFORE
> AFTER
> 
> Why *abc* does not appear?

Because error_log() does not produce any output:

<https://www.php.net/manual/en/function.error-log.php>

"error_log — Send an error message to the defined error handling routines"

And the error handling routines may not send the log message to the
output but only to the error log which is *not* send via HTTP to the client.

Next time please read the PHP manuals first, before asking here.

-- 
Arno Welzel
https://arnowelzel.de