I can change PHP between 5.3.3 and 5.4.40 and 5.5.24. After check system in PIWIK settings I have some errors:
shell_exec You need to enable this built-in function.
LOAD DATA INFILE
Using LOAD DATA INFILE will greatly speed Piwik’s archiving process up. To make it available to Piwik, try updating your PHP & MySQL software and make sure your database user has the FILE privilege.
If your Piwik server tracks high traffic websites (eg. > 100,000 pages per month), we recommend to try fix this problem.
Błąd: LOAD DATA INFILE failed… Error was:
Try #1: LOAD DATA INFILE : SQLSTATE[28000]: Invalid authorization specification: 1045 Access denied for user ‘user’@’%’ (using password: YES)[28000]
Troubleshooting: FAQ on piwik.org