Linux 系统 Composer 安装

Composer 是个包管理工具

在项目中使用它会很方便

本文中用 PHP 安装

1、下载安装

执行命令 curl -sS https://getcomposer.org/installer | php

2、配置环境变量

mv composer.phar /usr/local/bin/composer

3、设置国内镜像

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

4、遇到的问题

Q1：/usr/bin/env: php: No such file or directory
A1：找不到 php 执行文件，cp /usr/local/php/bin/php /usr/local/bin/php

Q2：执行 composer 抛出 Killed
A2：缓存不足导致，linux 增加缓存
free -m
mkdir -p /var/_swap_
cd /var/_swap_
dd if=/dev/zero of=swapfile bs=1M count=2000
mkswap swapfile
swapon swapfile
echo “/var/_swap_/swapfile none swap sw 0 0” >> /etc/fstab
free -m

Q3：
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- league/flysystem 1.0.53 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
- league/flysystem 1.0.53 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
- league/flysystem 1.0.53 requires ext-fileinfo * -> the requested PHP extension fileinfo is missing from your system.
- Installation request for league/flysystem (locked at 1.0.53) -> satisfiable by league/flysystem[1.0.53].

To enable extensions, verify that they are enabled in your .ini files:
- /usr/local/php/lib/php.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

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

A3：安装 fileinfo 扩展包
cd /usr/local/src/php-7.3.4/ext/fileinfo/
/usr/local/php/bin/phpize
./configure --with-php-config=/usr/local/php/bin/php-config