shell 安装 composer

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

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

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

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

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

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

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

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

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.