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How to upgrade php4 to php5 using yum

By: Jerry Slagger
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Date Added : May 31, 2009 Views : 727




So you are finally going to bite the bullet and upgrade that unsupported php4 to the latest php5. Great! Before you get to gun ho, you need to make sure the current web applications running on the server you are going to upgrade support php5. In most cases they do but still better safe than sorry.  Do your research first. If possible, setup a test server with php5 and then test your sites on that before upgrading a product sever. This is not required but it can save you a lot of headaches by minimizing the likely hood of your production websites going down.

Once you are ready to do the upgrade you will need to schedule the downtime and get current backups of your data. Make sure you verify your backups are good before you start making changes to the production server! Last thing you want is to have a major issue, have to recover from backups, and find the backups are useless!

Ok, now that you have prepared and are ready to upgrade php4 to php5 lets began.

1.    Login to the server as root. This can be done at the console or remotely via ssh.

2.    At the shell prompt enter:
       # yum php update.

3.    Review the packages that will be installed and if all looks good continue by entering Y.

4.    After the install completes rename php.ini.rpmnew to php.ini
       # mv /etc/php.ini /etc/php.ini.backup
       # mv /etc/php.ini.rpmnew /etc/php.ini

5.    Now restart Apache and you are all set.
       # service httpd restart

The server should now show php5 when you check your phpinfo(). Note, if you have any sites that use global registers you will need to turn them on for those sites. PHP5 does not have then on by default.

You can enable the global registers on a site-by site bases by putting the following in your .htaccess file.
php_admin_value register_globals "On"

Also, if you are using Zend Optimizer, DO NOT FORGET to upgrade it too. Click here for my my article on How To Install Zend.

For more information, please see:
PHP.net
yum
Apache





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