What is the best way to put DVD movies to iphone?

WHEN I don’t want to fund it twofold.My laptop or computer is mac pc.

You implement dvd ripper intended for mac.It could rip MOVIE to the majority of popular video tutorial formats such as MOV, M4V, MP4, WMV, ASF, MKV, AVI, FLV, F4V for example.and appropriate for iPod / iphone / iPad (iPad 2).
http://www.video-converter-on-mac.com/resource/articles/ripp_dvd_video.html
Hope it really is helpful back!

Convert employing handbrake
http://www.handbrake.fr (it’s free)
Then employ iTunes or even whatever program you use to transfer it in your phone.