composer 安装

php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
php composer-setup.php

移动 composer.phar，这样 composer 就可以进行全局调用：

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

切换为国内镜像：

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

更新 composer：

composer selfupdate

PS：

https://www.laozuo.org/11801.html

安装laravel项目报出这个错误，查询得知没有安装php的fileinfo.so扩展

MissingDependencyException in ImageManager.php line 133:PHP Fileinfo extension must be installed

我用的事lnmp安装包，找到lnmp1.4/src/php-5.6.31解压tar -jxvf php-5.6.31.tar.bz2

然后cd    lnmp1.4/src/php-5.6.31/ext/fileinfo

/usr/local/php/bin/phpize，得到数据

./configure -with-php-config=/usr/local/php/bin/php-config

make && make install

find /usr/local/php -nam php.ini

添加上extension=fileinfo.so  保存

重启就可以了。
———————
作者：lengyue1084
来源：CSDN
原文：https://blog.csdn.net/lengyue1084/article/details/79575761
版权声明：本文为博主原创文章，转载请附上博文链接！

2019/11/06：

如果出现

[Composer\Downloader\TransportException]
The “https://packagist.phpcomposer.com/packages.json” file could not be downloaded: SSL operation failed with code
1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
Failed to enable crypto
failed to open stream: operation failed

windows下请设置全量国内源：

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/，