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dio_truncate	Directories

Direct IO Functions	Last updated: Mon, 26 Oct 2026

dio_write

(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)

dio_write — Writes data to fd with optional truncation at length

Description

function dio_write(resource $fd, string $data, int $len = 0): int

dio_write() writes up to len bytes from data to file fd.

Parameters

fd: The file descriptor returned by dio_open().
data: The written data.
len: The length of data to write in bytes. If not specified, the function writes all the data to the specified file.

Return Values

Returns the number of bytes written to fd.

See Also

dio_read() - Reads bytes from a file descriptor

dio_truncate	Directories

Direct IO Functions	Last updated: Mon, 26 Oct 2026