AC68 getting MySQL to work with PHP

[subzero44]

Hello, I hope this is an appropriate forum for this question. Would welcome alternate suggestions if not.

I'm running dd-wrt build 28211 on an Asus RT-AC68U router. Works very well. I haven't considered other firmwares yet because it needs to interoperate with other dd-wrt routers so I figured dd-wrt would be easiest.

The problem I'm running into is that I can't get the PHP processor that's bundled with dd-wrt to work with the MySQL client that's part of Entware. I ran the following commands:

opkg install mysql-server
opkg install php5-mod-mysqli​

I created a small mysql database and checked that it worked. I created a PHP file and verified that it worked. Then I wanted to add mysqli calls from php. I issued the following commands to create a copy of dd-wrt's php.ini file to a writable directory and added the mysqli extension to it:

cp /etc/php.ini /opt/etc/php.ini
cat >> php.ini

extensions=mysqli
extension_dir="/opt/lib/php"​

Then I invoked dd-wrt's php against the new php.ini file and got the following:

php -c /opt/etc/php.ini
PHP Warning: PHP Startup: Unable to load dynamic library '/opt/lib/php/mysqli.so' - Error relocating /opt/lib/libmysqlclient.so.16: __isinf: symbol not found
​

I figured there must be a mismatch between the php and mysql versions:

php -v
PHP 5.5.26 (cli) (built: Nov 13 2015 20:33:09)

mysql -V
mysql Ver 14.14 Distrib 5.1.73, for openwrt-linux-gnu (arm) using readline 5.1​

So I figured I would simply install Entware's php and use that one instead of the dd-wrt one, but it wouldn't even install because it says it's already there so I figure I must be using compatible versions of mysql and php:

opkg install php5
Package php5 (5.6.16-1) installed in root is up to date
​

Any suggestions to get dd-wrt's php to work with entware's mysql?

Thanks,

Charles
Asus RT-AC68U dd-wrt 28211 entware-ng