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Wed, Nov 12, 2014 9:58 pm

Call to undefined function mysql_connect()

I finally resolved problems with access to MySQL databases on a CentOS 7 server from the command line yesterday - see MySQL service not running on CentOS 7 system - but when I visited web pages on the server that rely upon PHP code to access MySQL databases on the server, I was seeing blank pages, though other PHP web pages that didn't have any database access were displaying properly. When I checked the Apache error log for a website where the PHP code should have displayed data from a database, I saw "PHP Fatal error: Call to undefined function mysql_connect()" associated with attempts to load the web page containing the PHP code that connected to the MySQL database.

I verified that the php-mysql package was installed with rpm -qi php-mysql.

# rpm -qi php-mysql
Name        : php-mysql
Version     : 5.4.16
Release     : 23.el7_0.3
Architecture: x86_64
Install Date: Tue 11 Nov 2014 08:26:15 PM EST
Group       : Development/Languages
Size        : 237259
License     : PHP
Signature   : RSA/SHA256, Fri 31 Oct 2014 10:24:56 AM EDT, Key ID 24c6a8a7f4a80eb5
Source RPM  : php-5.4.16-23.el7_0.3.src.rpm
Build Date  : Fri 31 Oct 2014 09:07:27 AM EDT
Build Host  :
Relocations : (not relocatable)
Packager    : CentOS BuildSystem <>
Vendor      : CentOS
URL         :
Summary     : A module for PHP applications that use MySQL databases
Description :
The php-mysql package contains a dynamic shared object that will add
MySQL database support to PHP. MySQL is an object-relational database
management system. PHP is an HTML-embeddable scripting language. If
you need MySQL support for PHP applications, you will need to install
this package and the php package.

I created a PHP test page with the following code:

<title>PHP Test</title>


<h2>A test page</h2>

<?php echo "<p>Hello world</p>"; ?>

<?php phpinfo(); ?>


"Hello world" was displayed by the PHP echo command and the information from the phpinfo function was also displayed. I searched through the results displayed for references to "MySQL" and found mysql and mysqli sections, including the following:


MySQL Supportenabled
Active Persistent Links 0
Active Links 0
Client API version 5.5.37-MariaDB
MYSQL_SOCKET /var/lib/mysql/mysql.sock
MYSQL_INCLUDE -I/usr/include/mysql
MYSQL_LIBS -L/usr/lib64/mysql -lmysqlclient

Since it appeared that PHP support for MySQL was present, I restarted Apache with apachectl restart, though I didn't expect that to resolve the problem. But when I refreshed the web page afterwards, the information from the MySQL database was displayed. Apparently, I should have restarted Apache after I ran the systemctl start mariadb.service to start the MariaDB database service yesterday. MariaDB is a fork of MySQL.


  1. Fatal error: Call to undefined function mysql_connect()
    Date: May 16, 2012
  2. Resolving a Fatal error: Call to undefined function mysql_connect() in RedHat
    By: Shailesh N. Humbad
    Created: October 18, 2004
    Last Modified: July 24, 2011
    Articles on web development, software, and hardware

[/software/database/mysql] permanent link

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