没办法安装fileinfo扩展

512内存安装不了fileinfo。想问一下有什么其他办法安装。
LINUX命令下安装后，重启PHP 报错

1. [12-Oct-2018 02:17:03] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/www/server/php/70/lib/php/extensions/no-debug-non-zts-20151012/fileinfo.so' - /www/server/php/70/lib/php/extensions/no-debug-non-zts-20151012/fileinfo.so: cannot open shared object file: No such file or directory in Unknown on line 0

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