PHP Fatal error: Class Memcache not found in

Posted on: March 3, 2012 June 1, 2026
Categories: Uncategorized

Introduction

The error “PHP Fatal error: Class ‘Memcache’ not found” usually occurs when the Memcache PHP module is missing or not properly compiled in PHP. This issue commonly affects PHP applications that depend on the Memcache extension for caching functionality.

In some cases, enabling Memcache through EasyApache may show the module as enabled, but the extension may not actually compile correctly in PHP. In such situations, compiling the Memcache module manually from source is the recommended solution.

Prerequisites

Root or SSH access to the server
PHP development tools installed
Internet connection on the server
Basic knowledge of Linux commands

Implementation

Error Message

PHP Fatal error: Class ‘Memcache’ not found in

This error generally occurs when the Memcache PHP module is missing.

Step 1 – Download Memcache Source

mkdir repo

cd repo

wget http://pecl.php.net/get/memcache-3.0.6.tgz

tar -xvfz memcache-3.0.6.tgz

Step 2 – Compile and Install Memcache

cd memcache-3.0.6

phpize

You should see output similar to the following:

Configuring for:
PHP Api Version: 20041225
Zend Module Api No: 20060613
Zend Extension Api No: 220060519

Now continue with the compilation process:

./configure

make

make install

Step 3 – Enable Memcache in PHP

Add the Memcache extension entry to the php.ini file:

echo “extension=memcache.so” >> /usr/local/lib/php.ini

Restart Apache service:

service httpd restart

Verify the Installation

Check the Loaded php.ini File

php -i | grep php.ini

Example output:

Configuration File (php.ini) Path => /usr/local/lib
Loaded Configuration File => /usr/local/lib/php.ini

Verify Memcache Module

php -m | grep memcache

Expected output:

memcache

Example Installation Output