$ cat master/.htaccess
RewriteEngine On
RewriteRule ^(.*)$ src/index-debug.php [L]

$ cat docker-compose.yml
services:
web:
build: .
ports:
- 8014:80
volumes:
- .:/var/www/html
- ./docker/volumes/etc/php.ini:/usr/local/etc/php/php.ini

$ cat Dockerfile
FROM php:apache
RUN a2enmod rewrite

$ cat master/src/index-debug.php
<?php
error_log("error message 123");
var_dump(
ini_get('error_log'),
ini_get('log_errors'),
file_get_contents('/var/log/error.log'),
);

$ cat docker/volumes/etc/php.ini
log_errors = On
error_log = /var/log/error.log

$ docker-compose up -d
WARNING: Found orphan containers (xxx) for this project. If you removed
or renamed this service in your compose file, you can run this command
with the --remove-orphans flag to clean it up.
Starting xxx... done

$ curl http://localhost:8014/master/src/index-debug.php
string(18) "/var/log/error.log"
string(1) "1"
<b>Warning</b>: file_get_contents(/var/log/error.log): Failed to open
stream: No such file or directory in <b>/var/www/html/master/src/index-debug.php</b> on line <b>4</b><br /> bool(false)

Why?

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--- SoupGate-Win32 v1.05
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On 26/11/2022 12.18, SupaPlex wrote:

$ cat master/src/index-debug.php
<?php
error_log("error message 123");
var_dump(
    ini_get('error_log'),
    ini_get('log_errors'),
    file_get_contents('/var/log/error.log'),
);

$ curl http://localhost:8014/master/src/index-debug.php
string(18) "/var/log/error.log"
string(1) "1"
<b>Warning</b>:  file_get_contents(/var/log/error.log): Failed to open stream: No such file or directory in <b>/var/www/html/master/src/index-debug.php</b> on line <b>4</b><br /> bool(false)

Why?

Does the /var/log directory exist?
Does the user which runs the process have the right to write into the directory?

--

//Aho

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Il 26/11/22 13:28, J.O. Aho ha scritto:

On 26/11/2022 12.18, SupaPlex wrote:

$ cat master/src/index-debug.php
<?php
error_log("error message 123");
var_dump(
     ini_get('error_log'),
     ini_get('log_errors'),
     file_get_contents('/var/log/error.log'),
);

$ curl http://localhost:8014/master/src/index-debug.php
string(18) "/var/log/error.log"
string(1) "1"
<b>Warning</b>:  file_get_contents(/var/log/error.log): Failed to open
stream: No such file or directory in
<b>/var/www/html/master/src/index-debug.php</b> on line <b>4</b><br />
bool(false)

Why?

Does the /var/log directory exist?
Does the user which runs the process have the right to write into the directory?

$ docker run xxx ls -ld /var/log
drwxr-xr-x 1 root root 4096 Aug 23 13:04 /var/log

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Il 26/11/22 15:45, SupaPlex ha scritto:

$ docker run xxx ls -ld /var/log
drwxr-xr-x 1 root root 4096 Aug 23 13:04 /var/log

Furthermore

file_put_contents('/var/log/error.log', 123);

Output

file_put_contents(/var/log/error.log): Failed to open stream: Permission
denied

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sat, 26 Nov 2022 16:48:24 +0100, SupaPlex wrote:

Il 26/11/22 15:45, SupaPlex ha scritto:

$ docker run xxx ls -ld /var/log drwxr-xr-x 1 root root 4096 Aug 23
13:04 /var/log

Furthermore

file_put_contents('/var/log/error.log', 123);

Output

file_put_contents(/var/log/error.log): Failed to open stream: Permission denied

Not surprising, as, in your case, only root can create files in the /var/
log directory and the php process that attempts to file_put_contents()
to /var/log/error.log does not likely run as root.

Your ls listing shows
/var/log drwxr-xr-x 1 root root
which means that only processes run with effective userid of root can
update the directory with new or changed directory entries. That means
that /only root/ can create /var/log/error.log



To fix the problem, either change the permissions of /var/log to
permit your php process to write to it, or run your php process as root.

HTH
--
Lew Pitcher
"In Skills, We Trust"

--- SoupGate-Win32 v1.05
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Il 26/11/22 17:52, Lew Pitcher ha scritto:

...

# chown www-data:www-data /var/log/error.log

Problem solved!!!

Since we're here, you can reply to the thread
[docker] error_log() not write inside web page

--- SoupGate-Win32 v1.05
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SupaPlex, 2022-11-26 21:33:

Il 26/11/22 17:52, Lew Pitcher ha scritto:

...

# chown www-data:www-data /var/log/error.log

Problem solved!!!

Since we're here, you can reply to the thread
[docker] error_log() not write inside web page

Please first try to understand the very basics of how to use Docker and
how PHP works in general before asking stuff here.

Also there is a very extensive documentation available:

<https://www.php.net/docs.php>

<https://docs.docker.com>


--
Arno Welzel
https://arnowelzel.de

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