PHP funkce stream_select()
📅 11. 09. 2019
Obsah článku:
Dostupnost ve verzích: PHP 4.3.0
Runs the equivalent of the select() system call on the given arrays of streams with a timeout specified by tv_sec and tv_usec
Parametry
| Parametr | Datový typ | Výchozí hodnota | Poznámka |
|---|---|---|---|
$read | array | The streams listed in the read array will be watched to see if characters become available for reading (more precisely, to see if a read will not block - in particular, a stream resource is also ready on end-of-file, in which case an fread will return a zero length string). | |
$write | array | The streams listed in the write array will be watched to see if a write will not block. | |
$except | array | The streams listed in the except array will be watched for high priority exceptional ("out-of-band") data arriving. | |
$tv_sec | int | The tv_sec and tv_usec together form the timeout parameter, tv_sec specifies the number of seconds while tv_usec the number of microseconds. The timeout is an upper bound on the amount of time that stream_select will wait before it returns. If tv_sec and tv_usec are both set to 0, stream_select will not wait for data - instead it will return immediately, indicating the current status of the streams. | |
$tv_usec | int | null | See tv_sec description. |
Návratové hodnoty
int
On success stream_select returns the number of stream resources contained in the modified arrays, which may be zero if the timeout expires before anything interesting happens. On error false is returned and a warning raised (this can happen if the system call is interrupted by an incoming signal).
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Jan Barášek Více o autorovi
Autor článku podniká jako fullstack senior developer v Praze. Spravuje velké webové ekosystémy, které znáte a používáte. Během mnoha let nabral hluboké zkušenosti, které tímto webem předává dál.
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