Headers and client library minor version mismatch

Question

In PHP I'm getting the following warning whenever I try to connect to a database (via mysql_connect)

Warning: mysql_connect(): Headers and client library minor version mismatch. Headers:50162 Library:50524

In my php -i output I have the following values listed under mysqli

Client API library version => 5.5.24

Client API header version => 5.1.62

I've tried updating php5-mysql and php but I'm already at the latest version of both of them. How do I go about updating the header version so I stop seeing this warning?

EDIT

My MySQL files should all be updated to be the latest version:

$ apt-get install mysql.*5.5
. . .
mysql-client-5.5 is already the newest version.
mysql-server-core-5.5 is already the newest version.
mysql-server-5.5 is already the newest version.
mysql-testsuite-5.5 is already the newest version.
mysql-source-5.5 is already the newest version.

Removing old versions

$ apt-get remove mysql.*5.1
. . .
Package handlersocket-mysql-5.1 is not installed, so not removed
Package mysql-cluster-client-5.1 is not installed, so not removed
Package mysql-cluster-server-5.1 is not installed, so not removed
Package mysql-client-5.1 is not installed, so not removed
Package mysql-client-core-5.1 is not installed, so not removed
Package mysql-server-5.1 is not installed, so not removed
Package mysql-server-core-5.1 is not installed, so not removed
Package mysql-source-5.1 is not installed, so not removed

Answer 1

The root reason for this error is that PHP separated itself from the MySQL Client libraries some time ago. So what's happening (mainly on older compiles of linux) is that people will compile PHP against a given build of the MySQL Client (meaning the version of MySQL installed is irrelevant) and not upgrade (in CentOS this package is listed as mysqlclientXX, where XX represents the package number). This also allows the package maintainer to support lower versions of MySQL. It's a messy way to do it, but it was the only way given how PHP and MySQL use different licensing.

MySQLND solves the problem by using PHP's own native driver (the ND), which no longer relies on MySQL Client. It's also compiled for the version of PHP you're using. This is a better solution all around, if for no other reason that MySQLND is made to have PHP talk to MySQL.

If you can't install MySQLND you can actually safely ignore this error for the most part. It's just more of an FYI notice than anything. It just sounds scary.

Answer 2

I ran into the same issue on centos7. Removing php-mysql and installing php-mysqlnd fixed the problem. Thanks Carlos Buenosvinos Zamora for your suggestion.

Here are my commands on centos7 just in case this can be of help to anybody as most of the answers here are based on Debian/Ubuntu.

To find the installed php-mysql package

yum list installed | grep mysql

To remove the installed php-mysql package

yum remove php55w-mysql.x86_64

To install php-mysqlnd

yum install php-mysqlnd.x86_64

Answer 3

To compile php from source with MySQL native driver (mysqlnd),

cd /php/source/path
./configure <other-options> --with-mysql --with-mysqli --with-pdo-mysql
make clean    # required if there was a previous make, which could cause various errors during make
make
make install

From /php/source/path/configure --help.

--with-mysql=DIR        Include MySQL support.  DIR is the MySQL base
                      directory, if no DIR is passed or the value is
                      mysqlnd the MySQL native driver will be used
--with-mysqli=FILE      Include MySQLi support.  FILE is the path
                      to mysql_config.  If no value or mysqlnd is passed
                      as FILE, the MySQL native driver will be used
--with-pdo-mysql=DIR    PDO: MySQL support. DIR is the MySQL base directory
                      If no value or mysqlnd is passed as DIR, the
                      MySQL native driver will be used

One or more PHP MySQL extensions can be included by using these options.
If a value is not passed to these options, or if the value is mysqlnd, MySQL native driver will be used.

Answer 4

The same works for MySQL:

sudo apt-get install php5-mysqlnd

I've read this thread trying to find the solution for MySQL, and I've also seen ken's answer, but I ignored the solution for MariaDB, wasting a few hours that way. It wasn't clear for me that the same may apply to MySQL. This post is just to spare you the few hours I lost.

Answer 5

If u had access cpanel or whm for domain web hosting ...

In cPanel, Go to "Softwares and services" tab, >> and then click "Select PHP Version" >> set your desired version of php...

Eg. Current PHP version:

PHP Version [5.2] ( list of 5.2, 5.3, 5.4, 5.5, 5.6 available php versions)

Warning: Changing php modules and php options via PHP Selector for native php version is impossible

I selected 5.6 php version, after that error cleared on my wordpress blog site...

Answer 6

For WHM and cPanel, some versions need to explicty set mysqli to build.

Using WHM, under CENTOS 6.9 xen pv [dc] v68.0.27, one needed to rebuild Apache/PHP by looking at all options and select mysqli to build. The default was to build the deprecated mysql. Now the depreciation messages are gone and one is ready for future MySQL upgrades.