Composer The openssl extension is required for SSL/TLS protection

=============================新的解决方法（较完善）=================================

    Composer 是 PHP5以上 的一个依赖管理工具。它允许你申明项目所依赖的代码库，它会在你的项目中为你安装他们。Composer 不是一个包管理器。是的，它涉及 "packages" 和 "libraries"，但它在每个项目的基础上进行管理，在你项目的某个目录中（例如 vendor）进行安装。默认情况下它不会在全局安装任何东西。因此，这仅仅是一个依赖管理。

    安装好Composer时通过composer install，发现没有正常安装，而是提示：

  [Composer\Exception\NoSslException]
  The openssl extension is required for SSL/TLS protection but is not available. If you can not enable the openssl extension, you can disable this error , at your own risk, by setting the 'disable-tls' option to true.

   对于这个问题，我尝试使用下面的命令解决：

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1. composer config -g -- disable-tls true  

    然而出现了另外的问题：
  [Composer\Downloader\TransportException]
  Your configuration does not allow connections to http://packagist.org/packages.json. See https://getcomposer.org/doc/06-config.md#secure-http for details.

    所以需要再次进行设置，禁用SSL

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1. composer config secure-http false  
2.     composer config -g secure-http false  

    之后，一部分可以正常安装了，还有一部分提示超过300stimeout，所以对时间进行设置：

    增加COMPOSER_PROCESS_TIMEOUT，通过命令composer config --list看到默认是300s，然后通过命令composer config -g process-timeout 600增加COMPOSER_PROCESS_TIMEOUT至600s。

    至此，Composer能够正常运行。

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====Executing command 'composer update  "topthink/framework" --no-interaction --no-ansi'====

You are running composer with xdebug enabled. This has a major impact on runtime performance. See https://getcomposer.org/xdebug

                                                                               

  [Composer\Exception\NoSslException]                                          

  The openssl extension is required for SSL/TLS protection but is not availab  

  le. If you can not enable the openssl extension, you can disable this error  

  , at your own risk, by setting the 'disable-tls' option to true.             

                                                                               

update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [--no-suggest] [--with-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [-i|--interactive] [--root-reqs] [--] [<packages>]...

====composer command completed with exit code 1====

解决方法：composer config -g -- disable-tls true

或者开启php的ssl开启

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