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Programming PHP, 3rd Edition by Peter MacIntyre, Kevin Tatroe, Rasmus Lerdorf

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Name

uniqid

Synopsis

string uniqid([string prefix[, bool more_entropy]])

Returns a unique identifier, prefixed with prefix, based on the current time in microseconds. If more_entropy is specified and is true, additional random characters are added to the end of the string. The resulting string is either 13 characters (if more_entropy is unspecified or false) or 23 characters (if more_entropy is true) long.

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