Hi,
no, upload tmp dir is other think
BUT what I think is CPANEL !!
Configuration File (php.ini) Path /opt/cpanel/ea-php56/root/etc
Loaded Configuration File /opt/cpanel/ea-php56/root/etc/php.ini
Scan this dir for additional .ini files /opt/cpanel/ea-php56/root/etc/php.d
Additional .ini files parsed /opt/cpanel/ea-php56/root/etc/php.d/bcmath.ini, /opt/cpanel/ea-php56/root/etc/php.d/calendar.ini, /opt/cpanel/ea-php56/root/etc/php.d/ctype.ini, /opt/cpanel/ea-php56/root/etc/php.d/curl.ini, /opt/cpanel/ea-php56/root/etc/php.d/dom.ini, /opt/cpanel/ea-php56/root/etc/php.d/ftp.ini, /opt/cpanel/ea-php56/root/etc/php.d/gd.ini, /opt/cpanel/ea-php56/root/etc/php.d/imap.ini, /opt/cpanel/ea-php56/root/etc/php.d/json.ini, /opt/cpanel/ea-php56/root/etc/php.d/local.ini, /opt/cpanel/ea-php56/root/etc/php.d/mbstring.ini, /opt/cpanel/ea-php56/root/etc/php.d/mcrypt.ini, /opt/cpanel/ea-php56/root/etc/php.d/mysqlnd.ini, /opt/cpanel/ea-php56/root/etc/php.d/mysqlnd_mysql.ini, /opt/cpanel/ea-php56/root/etc/php.d/mysqlnd_mysqli.ini, /opt/cpanel/ea-php56/root/etc/php.d/pdo.ini, /opt/cpanel/ea-php56/root/etc/php.d/pdo_mysqlnd.ini, /opt/cpanel/ea-php56/root/etc/php.d/pdo_sqlite.ini, /opt/cpanel/ea-php56/root/etc/php.d/phar.ini, /opt/cpanel/ea-php56/root/etc/php.d/posix.ini, /opt/cpanel/ea-php56/root/etc/php.d/simplexml.ini, /opt/cpanel/ea-php56/root/etc/php.d/sockets.ini, /opt/cpanel/ea-php56/root/etc/php.d/sqlite3.ini, /opt/cpanel/ea-php56/root/etc/php.d/tokenizer.ini, /opt/cpanel/ea-php56/root/etc/php.d/xml.ini, /opt/cpanel/ea-php56/root/etc/php.d/xml_wddx.ini, /opt/cpanel/ea-php56/root/etc/php.d/xmlreader.ini, /opt/cpanel/ea-php56/root/etc/php.d/xmlwriter.ini, /opt/cpanel/ea-php56/root/etc/php.d/xsl.ini, /opt/cpanel/ea-php56/root/etc/php.d/zip.ini
You see there … some oufti many .ini file !!!
And maybe this : /opt/cpanel/ea-php56/root/etc/php.d/local.ini
Look to mbstring.ini …
But for me, all is CPANEL setting … you can do that maybe