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usleep - Delay execution in microseconds
usleep( int$microseconds ): void
Delays program execution for the given number of microseconds.
Halt time in microseconds. A microsecond is one millionth of a second.
Values larger than 1000000 (i.e. sleeping for more than a second) may not be supported by the operating system. Use sleep instead.
On Windows, the system may sleep longer that the given number of microseconds, depending on the hardware.
No value is returned.
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