! For those asking for free MySQL server:
Server MariaDB (it is MySQL fork) - https://play.google.com/store/apps/details?id=com.esminis.server.mariadb
PHP 5.4+, 7+ has these modules: core, date, ereg, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, hash, fileinfo, filter, ftp, gd, gettext, gmp, spl, iconv, intl, json, mbstring, mcrypt, session, standard, mysqlnd, mysqli, odbc, pdo, pdo_mysql, pdo_odbc, pdo_pgsql, pdo_sqlite, pgsql, phar, posix, pspell, recode, reflection, mysql, simplexml, soap, sockets, exif, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, cli_server, mhash, ssh2, opcache, phalcon, yaf, yar, id3, lzf, oauth, quickhash, bbcode, xmldiff, xdiff, rar, gender, stats, eio, judy, mailparse, rpmreader, spl_types, yaml