streamWrapper::stream_read

(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)

streamWrapper::stream_read — Read from stream

Descrizione

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

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

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

Elenco dei parametri

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

Valori restituiti

If there are less than count bytes available, as many as are available should be returned. If no more data is available, an empty string should be returned. To signal that reading failed, false should be returned.

Errori/Eccezioni

Emits E_WARNING if call to this method fails (i.e. not implemented).

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

Note

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

Avviso

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.

Vedere anche:

fread() - Legge un file salvaguardando la corrispondenza binaria
fgets() - Prende una riga da un puntatore a file

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