安裝tp6項目，提示下面這個
解決方法：
更新一下 composer 工具版本：
composer self-update
Warning from https://mirrors.aliyun.com/composer: Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer 2.
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Warning from https://repo.packagist.org: Support for Composer 1 is deprecated and some packages will not be available. You should upgrade to Composer
Warning from https://mirrors.aliyun.com/composer: You are using an outdated version of Composer. Composer 2.0 is now available and you should upgrade. See https://getcomposer.org/2
WARNING: You are using pip version 19.1.1, however version 19.2.1 is available. You should consider upgrading via the 'pip install --upgrade pip' command.
WARNING: You are using pip version 20.2.2; however, version 20.2.3 is available. You should consider upgrading via the '/usr/bin/python -m pip install --upgrade pip' command.
wget: 無法解析主機地址 “mirrors.aliyun.com”
pip install -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com mysqlclient
解決：使用pip命令安裝第三方庫時報錯WARNING: You are using pip version 19.2.3, however version 20.1.1 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command.
https://mirrors.aliyun.com/centos/7/isos/x86_64/CentOS-7-x86_64-Everything-2003.iso
執行composer install/update 命令遇 "You are using an outdated version of Composer. Composer 2.0 is abo...
You are running Composer with SSL/TLS protection disabled