PHP handler determines how PHP is loaded on the server. PHP handler is what actually loads the PHP libraries so that they can be used for interpretation. Different types of PHP handlers are DSO, suPHP, CGI, & FastCGI.
To change the PHP handler in WHM navigate to:
WHM >> Home >> Service Configuration » Configure PHP and suEXEC
To list the available PHP handlers via the command line run:
/usr/local/cpanel/bin/rebuild_phpconf –available
To list what is currently enabled run:
/usr/local/cpanel/bin/rebuild_phpconf --current
#/usr/local/cpanel/bin/rebuild_phpconf 5 none suphp 1
/usr/local/cpanel/bin/rebuild_phpconf 5 dso none 1
/usr/local/cpanel/bin/rebuild_phpconf 5 none cgi 1
/usr/local/cpanel/bin/rebuild_phpconf 5 none fcgi 1