PHP 7.3 “continue” targeting switch is equivalent to “break”. Did you mean to use “continue 2”?

Composer PHP7.3 SHA384 is not supported by your openssl extension
在使用composer 更新时候的,报错
解决方法
composer selfupdate
composer self-update

再次报错如下:
SHA384 is not supported by your openssl extension, could not verify the phar file integrity

解决(mac)
重新下载在安装
rm -f /usr/local/bin/composer
curl -s https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer

Remove Your older versions and install the latest version of Composer,
Remove Your older version: sudo rm -f /usr/local/bin/composer
Download the installer: sudo curl -s https://getcomposer.org/installer | php
Move the composer.phar file: sudo mv composer.phar /usr/local/bin/composer

参考:
https://www.heibaiketang.com/forum/show/173.html

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