在 centos7上安装php7.1以及composer的时候，遇到了一些坑，记录下，方便后面踩坑的人迅速定位问题。
安装php7.1:
yum -y install http://rpms.remirepo.net/enterprise/remi-release-7.rpm #其他php版本更换remi-php71即可。 yum-config-manager --enable remi-php71 yum -y install php
安装redis:
yum install https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/r/redis-3.2.12-2.el7.x86_64.rpm #启动redis: service redis start
安装composer:
curl -sS https://getcomposer.org/installer | php mv composer.phar /usr/local/bin/composer ln -s /usr/local/php /usr/local/bin/php
安装composer之后，启动更新会报错，报错如下:
Problem 1 - Installation request for magento/product-enterprise-edition 2.0.2 -> satisfiable by magento/product-enterprise-edition[2.0.2]. - magento/product-enterprise-edition 2.0.2 requires ext-gd * -> the requested PHP extension gd is missing from your system. To enable extensions, verify that they are enabled in those .ini files: - /etc/php5/cli/php.ini - /etc/php5/cli/conf.d/05-opcache.ini - /etc/php5/cli/conf.d/10-pdo.ini - /etc/php5/cli/conf.d/20-curl.ini - /etc/php5/cli/conf.d/20-imap.ini - /etc/php5/cli/conf.d/20-json.ini - /etc/php5/cli/conf.d/20-mcrypt.ini - /etc/php5/cli/conf.d/20-pdo_pgsql.ini - /etc/php5/cli/conf.d/20-pgsql.ini - /etc/php5/cli/conf.d/20-pspell.ini - /etc/php5/cli/conf.d/20-readline.ini You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
解决办法：
yum install php71-php-process.x86_64 -y
启动php GatewayMan程序后，可能会出现以下错误:
php start.php start Please install posix extension. See http://doc3.workerman.net/appendices/install-extension.html
原因是因为posix扩展缺失，解决办法：
yum install -y php-process
然后进行测试：
curl -Ss http://www.workerman.net/check.php | php PHP Version >= 5.3.3 [OK] Extension pcntl check [OK] Extension posix check [OK]
最后，php start.php start启动即可。