PHP funkce stream_select()
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 | není | 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 | není | The streams listed in the write array will be watched to see if a write will not block. |
$except | array | není | The streams listed in the except array will be watched for high priority exceptional ("out-of-band") data arriving. |
$tv_sec | int | není | 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).
Další zdroje
Jan Barášek Více o autorovi
Autor článku pracuje jako seniorní vývojář a software architekt v Praze. Navrhuje a spravuje velké webové aplikace, které znáte a používáte. Od roku 2009 nabral bohaté zkušenosti, které tímto webem předává dál.
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