Composer提示：Installation failed, reverting ./composer.json to its original content.错误，分别运行下面两条命令即可：
composer dump-autoload
composer update
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Composer提示：Installation failed, reverting ./composer.json to its original content.错误，分别运行下面两条命令即可：
composer dump-autoload
composer update
PHP：Invalid argument supplied Using $this when not in object