=============================新的解決方法（較完善）=================================

? ? Composer 是 PHP5以上 的一個依賴管理工具。它允許你申明項目所依賴的代碼庫，它會在你的項目中為你安裝他們。Composer 不是一個包管理器。是的，它涉及 "packages" 和 "libraries"，但它在每個項目的基礎(chǔ)上進(jìn)行管理，在你項目的某個目錄中（例如 vendor）進(jìn)行安裝。默認(rèn)情況下它不會在全局安裝任何東西。因此，這僅僅是一個依賴管理。

? ? 安裝好Composer時通過composer install，發(fā)現(xiàn)沒有正常安裝，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.

? ?對于這個問題，我嘗試使用下面的命令解決：

[plain]?view plaincopy

composer?config?-g?--?disable-tls?true??

? ? 然而出現(xiàn)了另外的問題：
? [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.

? ? 所以需要再次進(jìn)行設(shè)置，禁用SSL

[plain]?view plaincopy

composer?config?secure-http?false??

????composer?config?-g?secure-http?false??

? ? 之后，一部分可以正常安裝了，還有一部分提示超過300stimeout，所以對時間進(jìn)行設(shè)置：

? ??增加COMPOSER_PROCESS_TIMEOUT，通過命令composer config --list看到默認(rèn)是300s，然后通過命令composer config -g process-timeout 600增加COMPOSER_PROCESS_TIMEOUT至600s。

? ? 至此，Composer能夠正常運行。

================================================================

====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====

解決方法：composer config -g -- disable-tls true

或者開啟php的ssl開啟

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