How do I run PHP file in Ubuntu and fix the permission denied?

Question

When I try to save the file of PHP in Ubuntu I get that error:

unable to save /var/www/html/script.php 
Error permission denied

How can I fix this error and save/run the PHP file?

Answer 1

the problem that I faced was in permissions so, I have to change the chmod of a directory which I working on so, in this case, I should write the following command:

$ sudo chmod  o+w /var/www/html

The o stands for other and the + adds the permissions w is write.

at this moment the mode of the whole directory will change from reading to writing mode