无法安装composer - 缺少json扩展名

Question

我正在尝试在我的Ubuntu 13.10计算机上安装composer,但发生以下错误:

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 json extension is missing.
Install it or recompile php without --disable-json

php --version给了我PHP 5.5.3-1ubuntu2 (cli)所以我认为应该安装json扩展.

Answer 1

只需安装模块:

sudo apt-get install php5-json

编辑 - 原因:

见Heanzo Beanzo评论:

由于许可证冲突,它已在最近的软件包中被删除, 请参阅php.net上的错误.