The PHP fopen function returns false

apache2.4.6 php 7.2.2 installed with Yum returns False when opening a file using the fopen () function after proper installation

Baidu for three different reasons

1, directory or folder permissions reasons

(You can set the highest permissions with the Chmod-r 777 root folder)

2. Open File path error

3, open mode error (W,R,A), etc.

Determined not to have the above error

Add a PHP error report manually

// Error handler function function customerror ($errno$errstr) {          echo ' <b>error:</ b> [$errno$errstr";} // Set Error Handler Set_error_handler ("Customerror");

The error message returned is

Failed to open Stream:permission denied

Prove no permissions

Switch to read-only mode to open normally

Guess it's php that restricts permissions.

Search Open_basedir in php.ini view configuration, default is commented out, that is, there is no Limit permissions

Finally on the internet all kinds of Baidu

found that the default installation of the CentOS system has selinux rights management, and is enabled by default

Baidu has a bit of selinux, the introduction of most of them are directly closed, configuration seems to be very troublesome

Then it's still closed.

Vim/etc/selinux/conf

Can see

selinux= Enforcing

Revision changed to

Selinux=disabled

Can

Restarting the server

Write file again normal

The PHP fopen function returns false