包简介

Extras for pack() and unpack() functions

README 文档

README

ExtraPack

Extras for pack() and unpack() functions.

Install

composer require ddrv/extra-pack

<?php
require ('vendor/autoload.php');

Usage

<?php
$data = array(
    'key1' => 'string',
    'key2' => 5,
    'key3' => .0001
);
$format = 'A6key1/Ckey2/t4key3';
$binary = \Ddrv\Extra\Pack::pack($format, $data);
$result = \Ddrv\Extra\Pack::unpack($format, $binary);
print_r($result);

Array
(
    [key1] => string
    [key2] => 5
    [key3] => .0001
)

Format

character[+number]+key[+:added]

Elements are separated by a slash

Examples:

Format	Key	Result
A6name	name	string with length 6
Coffset:2000	offset	Number from 0 to 255 + 2000

Format characters

Currently implemented formats are:

Character	Is extras	Description	Support from PHP version	Number	Added
@	No	NUL-fill to absolute position	5.0	Position	No using
~	Yes	NUL-ended string	5.0	No using	No using
Z	No	NUL-padded string	5.5.0	Length of string	No using
x	No	NUL byte	5.0	Count iterations	No using
X	No	Back up one byte	5.0	Length of reserved string	No using
a	No	NUL-padded string	5.0	Length of string `may be *`	No using
A	No	SPACE-padded string	5.0	Length of string `may be *`	No using
h	No	Hex string, low nibble first	5.0	No using	No using
H	No	Hex string, high nibble first	5.0	No using	No using
c	No	signed char	5.0	No using	Added number
C	No	unsigned char	5.0	No using	Added number
s	No	signed short (always 16 bit, machine byte order)	5.0	No using	Added number
S	No	unsigned short (always 16 bit, machine byte order)	5.0	No using	Added number
n	No	unsigned short (always 16 bit, big endian byte order)	5.0	No using	Added number
v	No	unsigned short (always 16 bit, little endian byte order)	5.0	No using	Added number
m	Yes	signed medium (always 24 bit, machine byte order)	5.0	No using	Added number
M	Yes	unsigned medium (always 24 bit, machine byte order)	5.0	No using	Added number
l	No	signed long (always 32 bit, machine byte order)	5.0	No using	Added number
L	No	unsigned long (always 32 bit, machine byte order)	5.0	No using	Added number
N	No	unsigned long (always 32 bit, big endian byte order)	5.0	No using	Added number
V	No	unsigned long (always 32 bit, little endian byte order)	5.0	No using	Added number
q	No	signed long long (always 64 bit, machine byte order)	5.6.3	No using	Added number
Q	No	unsigned long long (always 64 bit, machine byte order)	5.6.3	No using	Added number
J	No	unsigned long long (always 64 bit, big endian byte order)	5.6.3	No using	Added number
P	No	unsigned long long (always 64 bit, little endian byte order)	5.6.3	No using	Added number
i	No	signed integer (machine dependent size and byte order)	5.0	No using	Added number
I	No	unsigned integer (machine dependent size and byte order)	5.0	No using	Added number
f	No	float (machine dependent size and representation)	5.0	No using	Added number
g	No	float (machine dependent size, little endian byte order)	7.0.15, 7.1.1	No using	Added number
G	No	float (machine dependent size, big endian byte order)	7.0.15, 7.1.1	No using	Added number
d	No	double (machine dependent size and representation)	5.0	No using	Added number
e	No	double (machine dependent size, little endian byte order)	7.0.15, 7.1.1	No using	Added number
E	No	double (machine dependent size, big endian byte order)	7.0.15, 7.1.1	No using	Added number
t	Yes	signed tiny rounded (always 8 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
T	Yes	unsigned tiny rounded (always 8 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
o	Yes	signed short rounded (always 16 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
O	Yes	unsigned short rounded (always 16 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
r	Yes	signed medium rounded (always 24 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
R	Yes	unsigned medium rounded (always 24 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
b	Yes	signed big rounded (always 32 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number
B	Yes	unsigned big rounded (always 32 bit, machine byte order)	5.0	Number of digits after the decimal point	Added number

ddrv/extra-pack 适用场景与选型建议

ddrv/extra-pack 是一款基于 PHP 开发的 Composer 扩展包，目前已累计 6 次下载、GitHub Stars 达 0，最近一次更新时间为 2018 年 01 月 31 日，在 PHP 生态内属于活跃度较高的组件。

它主要适用于以下技术方向：「pack」「Extras」「binary」「unpack」「binary-data」「binary-string」等业务场景。在实际项目中，围绕这些方向常见需要落地的问题包括：接口对接、性能调优、并发安全、与既有框架（Laravel / ThinkPHP / Yii / Webman 等）的兼容适配，以及生产环境的日志埋点与稳定性保障。

我们在过去多个企业项目中使用过 ddrv/extra-pack 或与其功能相近的方案，如果你在选型或落地过程中遇到问题，例如 版本兼容、二次改造、私有化封装、与内部系统对接、生产 BUG 排查，欢迎联系我们协助评估。

围绕 ddrv/extra-pack 我们能提供哪些服务？

定制开发 / 二次开发

基于 ddrv/extra-pack 在你已有业务上做功能扩展、字段裁剪、UI 适配、与内部账号 / 权限 / 日志系统的深度对接。

BUG 修复 & 性能优化

线上偶发问题、内存泄漏、慢查询、并发异常等排查修复；针对高流量场景做缓存、队列、索引层面的调优。

项目外包 & 长期维护

承接完整的项目从需求 → 设计 → 开发 → 上线 → 长期运维；也可按月提供技术保姆服务。

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