shell 安装 composer

安装composer，最好需要有php的软连接。

先执行一下以下命令查看是否php命令已经软连接好了。

[root@68 ~]# which php
/usr/bin/which: no php in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)

如果是这样，表示并不能直接使用php。我们这个时候需要对php做软连接。

我的php的路径在/usr/local/php/bin/php。所以命令就是：

ln -sf /usr/local/php/bin/php /usr/local/bin/php

然后我再执行一下开头的命令：

[root@68 bin]# which php
/usr/local/bin/php

好了。这样就可以进行安装了。我们仅仅需要下面这一条命令就可以了。

curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

当显示如下效果的时候，就表示安装完成了：

All settings correct for using Composer
Downloading...

Composer (version 1.3.0) successfully installed to: /usr/local/bin/composer
Use it: php /usr/local/bin/composer

这样我们就可以使用composer进行类库安装了。

修改为国内镜像

全局修改

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

碰到的问题

• phar "/usr/local/bin/composer" has a broken signature 错误:

PHP Fatal error:  Uncaught exception 'PharException' with message 'phar "/usr/local/bin/composer" has a broken signature' in /usr/local/bin/composer:23
Stack trace:
#0 /usr/local/bin/composer(23): Phar::mapPhar('composer.phar')
#1 {main}
  thrown in /usr/local/bin/composer on line 23

解决办法：删除文件包，重新安装。

• php缺失openssl扩展:

Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The openssl extension is missing, which means that secure HTTPS transfers are impossible.
If possible you should enable it or recompile php with --with-openssl

解决办法: PHP安装openssl扩展。

• php缺失zlib扩展:

The zlib extension is not loaded, this can slow down Composer a lot.
If possible, install it or recompile php with --with-zlib

The php.ini used by your command-line PHP is: /usr/local/php/etc/php.ini
If you can not modify the ini file, you can also run `php -d option=value` to modify ini values on the fly. You can use -d multiple times.

解决办法: PHP安装zlib扩展。