dio_open

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)

dio_open — Opens a new filename with specified permissions of flags and creation permissions of mode

Описание

resource dio_open ( string $filename , int $flags [, int $mode ] )

dio_open() opens a file and returns a new file descriptor for it.

Список параметров

filename

The opened file.

flags

The flags parameter can also include any combination of the following flags:

O_CREAT - creates the file, if it doesn't already exist.
O_EXCL - if both, O_CREAT and O_EXCL are set, dio_open() fails, if the file already exists.
O_TRUNC - if the file exists, and its opened for write access, the file will be truncated to zero length.
O_APPEND - write operations write data at the end of the file.
O_NONBLOCK - sets non blocking mode.

mode

If flags is O_CREAT, mode will set the mode of the file (creation permissions).

O_RDONLY - opens the file for read access.
O_WRONLY - opens the file for write access.
O_RDWR - opens the file for both reading and writing.

Возвращаемые значения

A file descriptor or FALSE on error.

Примеры

Пример #1 Opening a file descriptor


<?php

$fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK);

dio_close($fd);
?>

Смотрите также

dio_close()

add a note User Contributed Notes
dio_open

j at pureftpd dot org
23-Jan-2005 04:13


Please note that dio_open()/dio_write()/dio_close() is *faster* than fopen()/fwrite()/fclose() for files.



fwrite() has to manage a 8k buffer, while dio_write() just issue a single write(). The end result is less system calls and less memory access.



Also, giving the full size to write() as with dio_write() let filesystems properly use preallocation in order to avoid fragmentation.

alla at cyber dot com dot au
22-Mar-2003 07:16


To specify a combination of flags you OR them together.


This was the only way I could get it to append:





$fd = dio_open($file, O_WRONLY | O_APPEND);

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dio_read

dio_fcntl

Last updated: Fri, 21 Nov 2008