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微秒; microsecond; microseconds; µs; usamount in units (real)
mikrosekunde;mikrosekunden;µs;usamount in units (real)
Last Update: 2011-10-23
Usage Frequency: 1
Quality:
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.
b. auf mehreren servern gleichzeitig id´s erzeugen, was ja im ungünstigsten fall zur selben mikrosekunde geschehen kann.
Last Update: 2011-10-24
Usage Frequency: 1
Quality:
// seed with microseconds function make_seed() {list($usec, $sec) = explode(' ', microtime()); return (float) $sec + ((float) $usec * 100000);} mt_srand(make_seed()); $randval = mt_rand();
gleiche startwerte führen auch jeweils zu derselben pseudo-zufallssequenzen daher ist es üblich, diese über die aktuelle uhrzeit festzulegen:
Last Update: 2011-10-24
Usage Frequency: 1
Quality:
