composer install报错怎么办

错误代码如下：

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[root@localhost MarketingCenter]# composer install Loading composer repositories with package information Installing dependencies (including require-dev) from lock file Your requirements could not be resolved to an installable set of packages.     Problem 1     - Installation request for php-amqplib/php-amqplib v2.7.0 -> satisfiable by php-amqplib/php-amqplib[v2.7.0].     - php-amqplib/php-amqplib v2.7.0 requires ext-bcmath * -> the requested PHP extension bcmath is missing from      your system.   Problem 2     - php-amqplib/php-amqplib v2.7.0 requires ext-bcmath * -> the requested PHP extension bcmath is missing from      your system.     - php-amqplib/thumper v0.5.0 requires php-amqplib/php-amqplib ^2.6 -> satisfiable by php-amqplib/php-amqplib     [v2.7.0].     - Installation request for php-amqplib/thumper v0.5.0 -> satisfiable by php-amqplib/thumper[v0.5.0].     To enable extensions, verify that they are enabled in your .ini files:     - /etc/php.ini     - /etc/php.d/curl.ini     - /etc/php.d/fileinfo.ini     - /etc/php.d/json.ini     - /etc/php.d/phar.ini     - /etc/php.d/zip.ini   You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

由此可见，要给 php 增加扩展 ext-bcmath。

1、进入如下目录　　

cd /usr/local/php/lib

2、然后执行如下代码

yum install php-bcmath

即可安装成功，由上图问题还需要继续安装 mbstring。

yum install php-mbstring

回车即可安装成功，

最后解决了问题，再继续 composer install，好了操作完成！

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