When I create a table or modify a column, I get an error and the columns are duplicated. ΒΆ

It is possible to configure Apache in such a way that PHP has problems interpreting .php files.

The problems occur when two different (and conflicting) set of directives are used:

SetOutputFilter PHP SetInputFilter PHP 

and

AddType application/x-httpd-php .php 

In the case we saw, one set of directives was in /etc/httpd/conf/httpd.conf, while the other set was in /etc/httpd/conf/addon-modules/php.conf. The recommended way is with AddType, so just comment out the first set of lines and restart Apache:

#SetOutputFilter PHP #SetInputFilter PHP