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b. auf mehreren servern gleichzeitig id´s erzeugen, was ja im ungünstigsten fall zur selben mikrosekunde geschehen kann.
uniqid() returns a prefixed unique identifier based on the current time in microseconds. the prefix can be useful for instance if you generate identifiers simultaneously on several hosts that might happen to generate the identifier at the same microsecond. prefix can be up to 114 characters long.