streamWrapper::stream_read

(PHP 4 >= 4.3.2, PHP 5)

streamWrapper::stream_read — Read from stream

Beskrivelse

public string streamWrapper::stream_read ( int $count )

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

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

Parametre

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

Returnerings Værdier

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.

Fejl/Undtagelser

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

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

Noter

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

Advarsel

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.

Se også

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

add a note

User Contributed Notes

There are no user contributed notes for this page.