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CentOS的版本太低，6.5。自带的php版本也太低，laravel的最低要求是6.7，需要升级php。在centos中直接使用： yum update php，会提示已经是最新的了，是因为rpm的原因，当前仓储已不再更新php，php5.3已经是最高版本，可以通过更改rpm的方式获得更新：

rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
yum remove php-common       # Need to remove this, otherwise it conflicts
yum install php56w
yum install php56w-mysql
yum install php56w-common
yum install php56w-pdo
yum install php56w-opcache
php --version               # Verify version has been upgraded

参考链接： https://stackoverflow.com/questions/21502656/upgrading-php-on-centos-6-5-final

laravel需要的模块较多，需要手动装一些其他的模块，如：

yum install php56w-gd
yum install php56w-intl
yum install php56w-mbstring
yum install php56w-fpm

将laravel项目下的除去vendor的文件夹全部拷贝到服务器上，安装composer， 然后执行： 

curl -sS https://getcomposer.org/installer | php
composer install
php artisan migrate --seed

更新php-fpm， 杀死以前的php-fpm:

ps aux|grep php-fpm
kill -INT 18767
php-fpm

18767是以前的php-fpm的pid，检查是不是获取到最新的php-fpm

检查nginx的config的文件

server {
    listen       80;
    server_name  api.zhixingsoft.com;
    root /alidata/www/yishi_api/public;
    index index.php index.html index.htm;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location ~ \.php$ {
        try_files $uri /index.php =404;
        #fastcgi_pass  unix:/tmp/php-cgi.sock;
        fastcgi_pass  127.0.0.1:9000;
        fastcgi_index index.php;
        include fastcgi.conf;
    }
    location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
    {
        expires 30d;
    }
    location ~ .*\.(js|css)?$
    {
        expires 1h;
    }
    #伪静态规则
    #include /alidata/server/nginx/conf/rewrite/rewrite.conf;
    access_log  /alidata/log/nginx/access/yishi.log;
}