streamWrapper::stream_read

(PHP 4 >= 4.3.2, PHP 5, PHP 7)

streamWrapper::stream_read — Read from stream

Opis

public streamWrapper::stream_read ( int $count ) : string

This method is called in response to fread() and fgets().

Informacja:
Remember to update the read/write position of the stream (by the number of bytes that were successfully read).

Parametry

count: How many bytes of data from the current position should be returned.

Zwracane wartości

If there are less than count bytes available, return as many as are available. If no more data is available, return either FALSE or an empty string.

Błędy/Wyjątki

Zgłasza E_WARNING jeśli wywołanie tej metody nie powiedzie się (np. nie jest zaimplementowana).

Informacja:
If the return value is longer then count an E_WARNING error will be emitted, and excess data will be lost.

Notatki

Informacja:
streamWrapper::stream_eof() is called directly after calling streamWrapper::stream_read() to check if EOF has been reached. If not implemented, EOF is assumed.

Ostrzeżenie

When reading the whole file (for example, with file_get_contents()), PHP will call streamWrapper::stream_read() followed by streamWrapper::stream_eof() in a loop but as long as streamWrapper::stream_read() returns a non-empty string, the return value of streamWrapper::stream_eof() is ignored.

Zobacz też:

fread() - Odczyt pliku binarnie bezpieczy
fgets() - Pobiera linię ze wskaźnika pliku

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