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microsecond
1 e-6 s

a microsecond is one millionth of a second.
the usleep() function delays program execution for the given number of micro_seconds.

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.
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.

microseconds
1 e-6 s