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本文介绍了解决Composer在安装过程中遇到的问题的方法，包括更新Composer时出现的zlib_decode()错误及解决策略，同时还提供了如何配置国内镜像以加速包下载的速度。

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安装步骤参考链接：
http://laravelacademy.org/post/354.html

安装过程遇到的问题和解决：

提示composer 需要更新

使用composer self-update
但是可能出下面的问题，提示zlib_decode(): data error，解决办法在php.ini中更改：

zlib.output_compression = On
zlib.output_compression_level = 5

再次更新

F:\wamp7\wamp64\www>composer self-update
Updating to version fb6f6fd26c39b385a6feb087ff39238bc3ce67b2.
    Downloading: Connecting...


  [ErrorException]
  zlib_decode(): data error



self-update [-r|--rollback] [--clean-backups] [--no-progress] [version]

F:> composer self-update
Updating to version fb6f6fd26c39b385a6feb087ff39238bc3ce67b2.
    Downloading: 100%
Use composer self-update --rollback to return to version bc45d9185513575434021527d7756420e9f4b2cf

使用composer安装时，被墙

F:\wamp7\wamp64\www>composer global require "laravel/homestead=~2.0"
Changed current directory to C:/Users/Administrator/AppData/Roaming/Composer
./composer.json has been updated
Loading composer repositories with package information
The "https://packagist.org/packages.json" file could not be downloaded: failed to open stream: 由于连 接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。

https://packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date
Updating dependencies (including require-dev)

Installation failed, reverting ./composer.json to its original content.


  [Composer\Downloader\TransportException]
  The "http://packagist.org/p/laravel/homestead%246aae82af033f554361fee10b690
  e9758a21d5cb85821f499c77456b0a55d5a61.json" file could not be downloaded: f
  ailed to open stream: 由于连接方在一段时间后没有正确答复或连接的主机没有反应

解决办法
添加国内镜像，然后在执行上次命令，速度飞快
参考链接：http://pkg.phpcomposer.com/

composer config -g repo.packagist composer https://packagist.phpcomposer.com