First of all check if dpkg is installed on your machine by typing the following on the command line
[root@localhost php]# dpkg
If dpkg is installed you will get some similar response
[root@localhost php]# dpkg dpkg: need an action option Type dpkg --help for help about installing and deinstalling packages [*]; Use `dselect' or `aptitude' for user-friendly package management; Type dpkg -Dhelp for a list of dpkg debug flag values; Type dpkg --force-help for a list of forcing options; Type dpkg-deb --help for help about manipulating *.deb files;