code example

Hi all,
Can anybody point me to PHP code example to perform the following within the same session:
  1) login onto the login.html page (equivalent to the 
      curl -so a.tmp http://192.168.xxx.yyy/login.html -d"password=XXXXXX"
      command that works at shell level
  2) move to a second page http://192.168.xxx.yyy/second_page.html where to fetch the field with name FIELD4 from,
  3) move to a third page http://192.168.xxx.yyy/third_page.html where to modify the field with name FIELD234 
  4) end the session
Thanks for your help.
CB

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