Question 41594 in PHP Question posted in
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Not able to open a file in PHP, permission denied and also type-error with fwrite()

So I am trying to build a LAMP-app with Docker because I always have issues with installing PHP and such on my local machine.

Currently I am following a tutorial from Brad Traversy: PHP Crash Course on youtube and I am getting stuck at the part where he explains ‘filehandling’. Part 14.

This is the error I am getting:

Warning: fopen(users.txt): Failed to open stream: Permission denied in /var/www/html/filehandling.php on line 13

Fatal error: Uncaught TypeError: fwrite(): Argument #1 ($stream) must be of type resource, bool given in /var/www/html/filehandling.php:15 Stack trace: #0 /var/www/html/filehandling.php(15): fwrite(false, 'Brad') #1 {main} thrown in /var/www/html/filehandling.php on line 15

I also added screenshots of the error and file itself, my Dockerfile, and the docker-compose.yaml file.

errormessage in browser

filehandling.php

Dockerfile

docker-compose.yml

When I look up the user with ‘whoami’, I get user’root’ in the Docker container.
When I try ‘whoami’ outside of the container, I get my regular username.

I have tried changing permissions with chmod 755 and chmod 777 inside the Dockerfile, but that didn't work either.

Is there anybody who can help?

Thanks so much in advance!

Following @hakre advice:
This is what I get when I do ls -altrh inside of the containers shell:

This is what I get when I do ls -altrh inside the container:

# ls -altrh
total 68K
drwxr-xr-x 1 root root 4.0K Sep 13 09:45 ..
-rwxr-xr-x 1 1000 1000   14 Oct 14 14:57 phpinfo.php
drwxr-xr-x 2 1000 1000 4.0K Oct 14 18:51 db
-rwxr-xr-x 1 1000 1000    0 Oct 15 17:18 .env
-rwxr-xr-x 1 1000 1000   90 Oct 15 17:23 .env.example
-rwxr-xr-x 1 1000 1000    5 Oct 15 17:25 .gitignore
-rwxr-xr-x 1 1000 1000 3.7K Nov  9 17:15 variables.php
-rwxr-xr-x 1 1000 1000  468 Nov  9 17:32 getpost.php
-rwxr-xr-x 1 1000 1000  599 Nov 14 15:15 sanitizinginput.php
-rwxr-xr-x 1 1000 1000  167 Nov 14 15:38 cookies.php
-rwxr-xr-x 1 1000 1000  904 Nov 14 16:03 sessions.php
-rwxr-xr-x 1 1000 1000  225 Nov 19 17:10 package.json
drwxr-xr-x 4 1000 1000 4.0K Nov 20 15:26 .
-rwxr-xr-x 1 1000 1000  734 Nov 20 15:26 docker-compose.yml
-rwxr-xr-x 1 1000 1000  335 Nov 20 15:26 index.php
drwxr-xr-x 2 1000 1000 4.0K Nov 20 16:29 extras
-rwxr-xr-x 1 1000 1000  283 Nov 20 18:07 filehandling.php
-rwxr-xr-x 1 1000 1000   73 Nov 20 18:12 Dockerfile
#

Edit:
Also this is what I get when looking for the user of apache in the container’s shell:

# ps aux | egrep '(apache|httpd)'
root           1  0.3  0.1 219560 28892 ?        Ss   09:28   0:00 apache2 -DFOREGROUND
www-data      23  0.0  0.0 219592  7804 ?        S    09:28   0:00 apache2 -DFOREGROUND
www-data      24  0.0  0.0 219592  7804 ?        S    09:28   0:00 apache2 -DFOREGROUND
www-data      25  0.0  0.0 219592  7804 ?        S    09:28   0:00 apache2 -DFOREGROUND
www-data      26  0.0  0.0 219592  7804 ?        S    09:28   0:00 apache2 -DFOREGROUND
www-data      27  0.0  0.0 219592  7804 ?        S    09:28   0:00 apache2 -DFOREGROUND
root          35  0.0  0.0   3180   652 pts/0    S+   09:29   0:00 grep -E (apache|httpd)

And tried changing these in the Dockerfile, not at the same time of course:

RUN chown -R www-data /var/www/html/ 
and this: RUN chown -R www-data:www-data /var/www/html/ 
and this: RUN chown 777 /var/www/html 
and this: RUN chown 777 www-data /var/www/html

But no success –

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I have changed the Dockerfile to this:

    FROM php:8.1.10-apache

WORKDIR /var/www/html

RUN docker-php-ext-install mysqli pdo pdo_mysql

RUN chown -R www-data:www-data /var/www

# Create a new user
RUN adduser --disabled-password --gecos '' developer

# Add user to the group
RUN chown -R developer:www-data /var/www

RUN chmod 755 /var/www

# Switch to this user
USER developer

    And also changed the variable's path $file to 'extras/users.txt' again. This worked!


  2. 0

    The fopen() function opens a file or URL.

    Syntax

    fopen(filename, mode, include_path, context)

    Example

    <?php
$file = fopen("test.txt", "r");

//Output lines until EOF is reached
while(! feof($file)) {
  $line = fgets($file);
  echo $line. "<br>";
}

fclose($file);
?>

    Your Issue:
    Most likely the code is looking in another directory so the directory must be explicitly specified to avoid such errors. It must also ensure that the necessary permissions are obtained.

    fopen('/path/to/file/test.txt','r');

    You can make this easier by using some functions that make it easier to get your directory

    fopen($_SERVER['DOCUMENT_ROOT'].'test.txt','r');

    References:

    W3Schools fopen Function

    PHP: fopen() Permission denied

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