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# dio_open

(PHP 4 >= 4.2.0)

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

## Description

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

dio_open() opens a file and returns a new file descriptor for it, or -1 if any error occurred. If `flags` is O_CREAT, optional third parameter `mode` will set the mode of the file (creation permissions). The `flags` parameter can be one of the following options:

- 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

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 file already exists

- O_TRUNC - if file exists, and its opened for write access, file will be truncated to zero length.

- O_APPEND - write operations write data at the end of file

- O_NONBLOCK - sets non blocking mode

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