php and default salt length

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Hi I'm having some issues with the crypt(md5), I have been moving some
passwords from a php4 and linux based server to a solaris machine with php5.
The passwords are not readable, and some investigation points to the default
salt length being 2 compared to 13 on the other machine.  How do I set the
default salt length, is it somewhere in php.ini?

Also assuming I set the default salt length will the passwords become
useable again or is there some random data on the old server I need to
capture before that will work.

Any help is appreciated.


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