dio_read

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

dio_read — Reads bytes from a file descriptor

说明

dio_read(resource $fd, int $len = 1024): string

The function dio_read() reads and returns len bytes from file with descriptor fd.

参数

fd: The file descriptor returned by dio_open().
len: The number of bytes to read. If not specified, dio_read() reads 1K sized block.

返回值

The bytes read from fd.

参见

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

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User Contributed Notes 2 notes

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matt at vhub dot com ¶

16 years ago


Note that dio_read on Windows (other platforms unknown) will not timeout if there is no data to read. There is no way to specify a timeout or do a non-blocking read on Windows.

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-8

alban ¶

12 years ago


I am using dio functions on windows to read RS232 port.
I can read/write but it seems that the write function cannot be binary.

In particular: 
dio_write($com1,chr(10),1); will result in writing 2 bytes 0D 0A be cause \n is translated to \r\n. I have not found any way to overcome this limitation so far

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官方地址：https://www.php.net/manual/en/function.dio-read.php

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dio_read

说明

参数

返回值

参见

User Contributed Notes 2 notes