ISSUE SUMMARY:
I updated Jomsocial using Ijoomla to v4.2.1 and a error page comes up after login. I did not install it on my production site, I was testing it on localhost first.

How do I fix this error?

I tried this fix but it did not work:
www.jomsocial.com/forum/installation/336...ding-to-4-2-1#162289

Error: 0 Call to undefined function mysql_real_escape_string()

are you using php7, right? please read this solutiion stackoverflow.com/questions/13856639/mys...-string-is-undefined I hope it will help

Yes I am using PHP 7. I tried that stack overflow solution already and it didn't work, then I contacted you.

placing the "extension=mysql.so" line uncommented didn't work. The php.ini file is attached for your review.

By the way my server is a windows server, I don't think .so extensions would work. I tried enabling mysql.dll extension but that didn't work either. php_mysqli.dll and php_pdo_mysql.dll is on.

Please you try on your server, but try on your development folder.. and if you have this issue there ask your server admin.

I searched all whole codes on version 4.2.1, we dont use this function mysql_real_escape_string, it can be cuased from Joomla itself..

Yes but I did an upgrade from v4.1 via Ijoomla remember? Joomla was working fine when I upgraded it to v3.5, Jomsocial 4.1 as well. Both were working fine on PHPv7. The problem happened when right after I upgraded Jomsocial to 4.2.1 using IJoomla. Maybe some old files didn't get overwritten.

Where is dev site? I can debug and know the issue from there.. i need to know from which file that code be called :)

thank you!