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

add a note

User Contributed Notes 2 notes

down

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.

down

-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

add a note

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

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 [原创]诡异的php-fpm超时问题 php中几种注释规范支持php7的性能采集扩展

略微加速

PHP官方手册 - 互联网笔记

dio_read

说明

参数

返回值

参见

User Contributed Notes 2 notes