php - Shortest unique ID based on date and time? -


what shortest unique id can created php without using database? guess it's based on date+time (24 hour time format?) how short can be?

for php inbuilt solution uniqid (http://php.net/manual/en/function.uniqid.php).

$id = uniqid('',true);

alternatively create uuid. example see: php function generate v4 uuid


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