下午在安装 Laravel 框架过程中，遇到了不少问题，因为 Laravel 的安装依赖于 composer，这里就先介绍一下 composer 的安装方法：
安装方法：
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#下载
sudo curl -sS https://getcomposer.org/installer | sudo php -d detect_unicode=Off
#更改文件权限
sudo chmod a+x composer.phar
#移动文件
sudo chmod a+x composer.phar
#更新
sudo composer self-update这样就可以使用 composer 了。
[root@localhost www.111com.net]# composer
Zend Guard Loader requires Zend Engine API version 220090626.
The Zend Engine API version 220121212 which is installed, is newer.
Contact Zend Technologies at http://www.zend.com/ for a later version of Zend Guard Loader.
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Composer version aa9c257f0efd1a54c93ba95282821a497bc15d75 2014-03-09 15:09:15
Usage:
[options] command [arguments]
Options:
--help -h Display this help message.
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