PHP mysql_connect to remote server

I am moving an application to a different set of servers with an upgraded stack.  I'm going from one Ubuntu server with standard MySql to a pair of CentOS servers.  The DB server runs MariaDB.

I can now make the remote connection using mysql -h -u my_user -p my_database, indicating that the firewall is not the problem and neither are the permissions.

However, mysql_connect fails.  I've temporarily hard-coded the parameters so I'm sure I'm attempting the right connection.

What other errors should I look for?

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Daniel WilsonAsked:
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Dave BaldwinFixer of ProblemsCommented:
Please post the actual error message you're seeing.  Also, the versions of PHP on the old and the new servers.
Ray PaseurCommented:
It could be that MySQL (deprecated for a few years now) is throwing the errors.  This article will show you how to do the upgrade.  It will also show you how to get the error messages so we can figure out what might be wrong.

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Daniel WilsonAuthor Commented:
Can't connect to MySQL server on '10.x.y.z' (13)

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Oops, yeah, I've upgraded to php 5.6.6.

So ... the upgrade to the newer library is forced.

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