(PHP 4 >= 4.3.2, PHP 5, PHP 7)
streamWrapper::stream_read — Read from stream
Remember to update the read/write position of the stream (by the number of bytes that were successfully read).
How many bytes of data from the current position should be returned.
If there are less than
bytes available, return as many as are available. If no
more data is available, return either
FALSE or an
E_WARNING if call to this method fails
(i.e. not implemented).
If the return value is longer then
E_WARNINGerror will be emitted, and excess data will be lost.
streamWrapper::stream_eof() is called directly after calling streamWrapper::stream_read() to check if EOF has been reached. If not implemented, EOF is assumed.
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.