Changed php version on contao 3

After changing php version to 7 and connecting via MySQLi, i can to login backend, change settings. I changed code for undefined function but when i try to open any page, i get white page with 1 js effect. Every single page is same. I tried to disable articles on page, still same. Disabled in layout everything, every module, still same. Someone know why might this happen ?

Quote:

---

Originally Posted by rawelja

I changed code for undefined function

---

Sorry, but I don't get the problem. What did you do? Can you elaborate?

I have several Contao 3 installations running on PHP 7.
You should take a look a system/logs/error.log or set

Code:

---

$GLOBALS['TL_CONFIG']['displayErrors'] = true;

---

in your system/config/localconfig.php.

If you have a white page this means that there is a "php Fatal Error" somewhere.

Maybe it is an extension using the String class or something similar.