I have installed Xcache in cpanel server which is enabled suphp with php5. xcache.ini shows correct xcache.so file path. root@ [~/]# php -v PHP 5.2.13 (cli) (built: May 15 2010 01:49:12) Copyright (c) 1997-2010 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies with the ionCube PHP Loader v3.3.14, Copyright (c) 2002-2010, by ionCube Ltd., and with Zend Optimizer v3.3.9, Copyright (c) 1998-2009, by Zend Technologies Segmentation fault (core dumped) Will php5 version support Xcache ? or need to download php version to 4? Is there any problem with Zend Optimizer v3.3.9 latest version? Please provide some solution for this error.