Errors while upgrading laravel 5.2.* to 5.3.*

Hello Friends,

Laravel update from 5.2.x to 5.3.x
Sites update from laravel 5.2.X to 5.3.X here is a list of some errors with solutions.

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- laravel/framework v5.3.9 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.

CMD: sudo apt-get install php7.0-mbstring
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- php-http/curl-client v1.6.2 requires ext-curl * -> the requested PHP extension curl is missing from your system.

CMD: sudo apt-get install php-curl
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- phpunit/phpunit 4.8.9 requires ext-dom * -> the requested PHP extension dom is missing from your system.

CMD: sudo apt-get install php-xml
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For more details mail me on nelson.desai@gmail.com or comments here.

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Thank You

Nelson Desai