Php Upgradation with php3 to php4

Hi
  Want to upgrade php3 with php4 . What i have to do ...
 Or is it simple installation ..... I am using lot of files with php3 will
it effect on my files i am very new in php plz explain me with all details..


Thanks
Bipin
SoftGurusAsked:
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ThGCommented:

Here you will find everything you always wanted to know about:
Appendix B. Migrating from PHP 3 to PHP 4
http://it2.php.net/manual/en/migration4.php

if anything is unclear after reading it, ask here.
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