>> Username is no problem, the Unix encrypted
>> password is the one I am trying to work out.  If the user has a
>> password of:  phprocks and in /etc/passwd
>> that encrypted password works out to be:  !#@KJCKMSD@, then I
>> validate the user, they enter the correct username and password,
>> will PHP be able to validate that the password they entered matches
>> the encrypted password.

Just as Peter said, you can use crypt to check the passwords, it'll be
something like:

if ( '!#@KJCKMSD@' == crypt( 'phprocks', substr( 'phprocks', 0, 2 ) ) )
    // Validation succeeded
    // Invalid password

Crypt can not be unencrypted, but you can of course compare the crypted


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