streamWrapper::stream_read

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

streamWrapper::stream_read — Read from stream

Descrierea

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

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

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

Parametri

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

Valorile întoarse

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.

Erori/Excepții

Emite o eroare E_WARNING dacă apelul acestei metode eșuează (de ex. nu este implementată).

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

Note

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

Avertizare

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.

A se vedea și

fread() - Binary-safe file read
fgets() - Gets line from file pointer

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