I ve been working a little bit on a Facebook application, but when I registered a new user to test the friend interaction the new user got a uid (100000XXXXXXXXX) that seems to big for php to handle.
Saving the number in the database results in the same value (2147483647). I m guessing this is also PHPs fault, as I would believe the uid would fit in an unsigned bigint?
I m not quite sure where to go from here, any suggestions?
The fix is to store the UID as a string always. Use the VARCHAR field type in MySQL and you will be fine.
In general, many database gurus will tell you that interpreting another application s foreign keys (like UID in this case) is bad bad bad and you should handle them as opaque text.
Facebook recommonds to store it as a BIGINT unsigned.
User object details and connections can be found here.
For PHP, you d store it as a string (because, ultimately, if you re going to use it, it s going to be displayed on the page or in JSON data or something else that s stringy. There s no real need to perform arithmetic on that number).
I m using BIGINT UNSIGNED for a couple applications and it works just fine.
What type of MySQL field are you storing the UID data in? An unsigned bigint can store up to 18446744073709551615. (See http://dev.mysql.com/doc/refman/5.0/en/numeric-type-overview.html)
Simply update your schema via something like...
ALTER TABLE <table name> MODIFY COLUMN <column name> BIGINT UNSIGNED NOT NULL;
...and I suspect all will be well.
NB: You ll want to try this on a backup to ensure I m not deeply incorrect. :-)
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