composerインストール失敗解決方法

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === '669656bab3166a7aff8a7506b8cb2d1c292f042046c5a994c43155c0be6190fa0355160742ab2e1c88d40d5be660b410') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"

でもインストール中に

Signature mismatch, could not verify the phar file integrity

最後にcomposerを手動でダウンロード、インストール

cp composer.phar /usr/local/bin/composer
chmod u+x /usr/local/bin/composer
composer --help

このインタフェースが現れたら成功しました

Usage:
  help [options] [--] []

Arguments:
  command                        The command to execute
  command_name                   The command name [default: "help"]

Options:
      --xml                      To output help as XML
      --format=FORMAT            The output format (txt, xml, json, or md) [default: "txt"]
      --raw                      To output raw command help
  -h, --help                     Display this help message
  -q, --quiet                    Do not output any message
  -V, --version                  Display this application version
      --ansi                     Force ANSI output
      --no-ansi                  Disable ANSI output
  -n, --no-interaction           Do not ask any interactive question
      --profile                  Display timing and memory usage information
      --no-plugins               Whether to disable plugins.
  -d, --working-dir=WORKING-DIR  If specified, use the given directory as working directory.
  -v|vv|vvv, --verbose           Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Help:
  The help command displays help for a given command:

    php /usr/local/bin/composer help list

  You can also output the help in other formats by using the --format option:

    php /usr/local/bin/composer help --format=xml list

  To display the list of available commands, please use the list command.