Personally, I like to roll my own at least the first time around. Mainly, I do this for the educational value of trial and error and then comparing what I came up with to the standard ways of doing it. Here how I do it:

• I take the elements returned by localtime
  ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime;
• randomize the order
• concatenate them
• I then prefix a standard string ( I use a different prefix for each website)
• I then md5_hex the whole thing

Before storing the session id in MySQL, I confirm that it is unique. To date this has never returned a duplicate id.

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