Warnings with PHP 7.1 and 7.2

FILE: /var/www/html/wp-content/plugins/profile-builder/front-end/edit-profile.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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78 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$form_name}
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FILE: /var/www/html/wp-content/plugins/profile-builder/front-end/register.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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162 | WARNING | Global with anything other than bare variables is discouraged since PHP 7.0. Found ${$form_name}
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Hello,
beside the problem mentioned here: https://wordpress.org/support/topic/php-warnings-after-updating-to-2-7-8/
here are also a few warnings that i found with PHP compatilibity checker.

FILE: /var/www/html/wp-content/plugins/profile-builder/features/functions.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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172 | WARNING | Function create_function() is deprecated since PHP 7.2; Use an anonymous function instead
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