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php使用ffmpeg获取视频第一帧为缩略图环境centos7安装ffmpeg项目安装ffmpeg包php代码环境centos 7ffmpeg version 2.8.15 Copyrightcentos7安装ffmpegcentos7安装ffmpegsudo rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.rosudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x8

问题composer install 报错[Composer\Json\JsonValidationException] "./composer.json" does not match the expected JSON schema: - name : D

php composer安装扩展 xmlseclibs切换非root用户su www进入 项目目录php composer.phar require "robrichards/xmlseclibs"github地址：https://github.com/robrichards/xmlseclibs

环境：centos 7php问题composer安装包提示Problem 1 - Root composer.json requires mdanter/ecc ^0.5.2 -> satisfiable by mdanter/ecc[v0.5.2]. - mdanter/ecc v0.5.2 requires ext-gmp * -> it is missing from your system. Install or enable PHP's gmp extensi