file_put_contents not creating txt file

I had the same trouble recently and stumbled upon this question. Unfortunately choppyfireballs the OP said in a comment he found his own solution and just accepted an answer that wasn't helping any of us... Then after a search and a success to make file_put_contents work again I decided to share my solution.

The permissions of my files and directories were ok to accept any writing (make sure your directories are chmod 757 this will give the root and others the grant to write files in the location). If it still doesn't work like it didn't for me, that's because your system is probably SELinux (Security Enhanced Linux) system.

If you want to make sure write setenforce 0 this will turn selinux to permissive mode, run your script again, if it works then it means the problem is well described.

In that case turn selinux on back setenforce 1 and try ls -Zl in the directory where the directory of your project is. this will give you a line like

drwx---r-x.  9  root   root  system_u:object_r:httpd_sys_content_t:s0  4096  Dec  8  00:25  project

or something different but httpd_sys_content_t if you used chcon to transfer the context from one directory to this one. but if you don't have httpd_sys_content_t it's ok because we need to change the context of that directory anyways.

first you need to accept any public_content_rw_t contexts to write file. Type

setsebool -P httpd_anon_write on

This will set (P)ermanently SELinux boolean httpd_anon_write to true and any context dubbed as public_content_rw_t will have the rights to write any files in their own location.

Now you have to say SELinux that your project directory is public_content_rw_t or you'll still not be able to write files. Type :

semanage fcontext --add --type public_content_rw_t "/project(/.*)?"

and restorecon -RvF /project to tell selinux to apply the above specifications.

Now your directory is public_content_rw_t and you should be able to write files.

Your problem is likely due to apache not having permissions to write to the file location you specified. Go to that directory and check the permissions and group ownership with the ls command:

cd "My working file location"
ls -l .

There are three columns in the output that show the permissions, owner, and group for the directory. Most likely they are owned by root and don't have permissions for apache to write to the directory.

If this is the case, then you will see an error appear in your apache log when it tries to create the file. Try tailing your logs while running the script in your browser:

tail -f /var/log/apache2/error.log