How To Install Zend Guard Loader on CentOS 6

Install Zend Guard Loader on CentOS 6

In this tutorial, we will show you how to install the Zend Guard Loader on CentOS 6. For those of you who didn’t know, Zend Guard Loader is a free runtime application that enables PHP to run the scripts encoded by Zend Guard. The Guard Loader extension must be installed on each Web server that runs files that were encoded with, or use, Zend Guard licenses. The Zend Guard Loader translates encoded files to a format that can be parsed by the Zend Engine. This runtime process uses the Zend engine as a trigger to start the Zend Guard Loader component. At the time of writing this article, Zend Guard Loader supports PHP 5 or higher.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you the step-by-step installation Zend guard loader (Zend Optimizer) on CentOS 6.


  • A server running one of the following operating systems: CentOS 6.
  • It’s recommended that you use a fresh OS install to prevent any potential issues.
  • SSH access to the server (or just open Terminal if you’re on a desktop).
  • A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install Zend Guard Loader on CentOS 6

Step 1. Download Zend Guard Loader packages.

Zend Guard Loader can only be downloaded while logged in to your Zend account. You cannot directly download it to your server. So, you’ll need to download the .tar.gz file and then SFTP it to your server:


Extract Zend Guard Loader:

tar xzvf name-of-package-file.tar.gz

Now enter the new folder extracted and find the ZendGuardLoader.so file, let’s copy it to the modules folder:

## CentOS 32-bit ##
cp ZendGuardLoader.so /usr/lib/php/modules
## CentOS 64-bit ##
cp ZendGuardLoader.so /usr/lib64/php/modules

Create a ZendGuard.ini file inside /etc/php.d directory:

nano /etc/php.d/ZendGuard.ini
## CentOS 32-bit ##
; Enable Zend Guard extension

## CentOS 64-bit ##
; Enable Zend Guard extension

Step 2. Restart Apache service.

service httpd restart

Step 3. Verify Zend Guard Loader Is Enabled.

Run the following command to verify Zend Guard Loader is enabled:

php -v

Congratulations! You have successfully installed Zend Guard Loader. Thanks for using this tutorial for installing the Zend guard loader (Zend Optimizer) on CentOS 6 system. For additional help or useful information, we recommend you check the official Zend Guard website.

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r00t is a seasoned Linux system administrator with a wealth of experience in the field. Known for his contributions to idroot.us, r00t has authored numerous tutorials and guides, helping users navigate the complexities of Linux systems. His expertise spans across various Linux distributions, including Ubuntu, CentOS, and Debian. r00t's work is characterized by his ability to simplify complex concepts, making Linux more accessible to users of all skill levels. His dedication to the Linux community and his commitment to sharing knowledge makes him a respected figure in the field.
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