Руководство по PHP
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dio_write

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.4)

dio_write -- Writes data to fd with optional truncation at length

Описание

int dio_write ( resource fd, string data [, int len] )

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

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.

Returns the number of bytes written to fd.

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dio_truncate	Уровень выше	Функции для работы с каталогами