PHP fopen() 权限被拒绝

Question

I'm a PHP learner and I'm working with files but I can't open a file in my own server because there is a "permission denied" error. I'm using fopen() function: fopen('file.txt', 'r+');

I'm using Apache 2.4.37 and PHP 7.2.11 in a CentOS. I've been searching a lot in the internet but nothing worked, I had installed fpm, I tried with other PHP version, I check that allow_url_fopen is turned on, I reinstalled PHP and Apache, I ensured all permissions are OK.I also install in a VM other CentOS but the problem was on it too, then I tried with Ubuntu and it worked perfectly but my server is running in CentOS.

Answer 1

Ok, I have searching all the day but finally I resolved it. The problem was about SELinux.

I don't know why but SELinux comes in enforcing mode by default but when I turned it off all was solved. If you don't want to turn it off because security reasons you can set permissions but it's kind advanced for beginners users to understand. I found how to set these permissions here: https://serverfault.com/a/819370

If you don't want to fight against SELinux you can turn it off by editing /etc/sysconfig/selinux and put permissive (recommended) or disabled after SELINUX=

If you want to learn more about SELinux, DigitalOcean has an excellent posts about that: https://www.digitalocean.com/community/tutorial_series/an-introduction-to-selinux-on-centos-7