Checking PHP before update, to PHP 7.3

Any solutions for this ?
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FILE: /var/www/0/XXXXXX/www/wp-content/plugins/nextend-facebook-connect/includes/oauth2.php
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FOUND 3 ERRORS AFFECTING 1 LINE
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219 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
219 | ERROR | Function mcrypt_create_iv() is deprecated since PHP 7.1 and removed since PHP 7.2; Use random_bytes() or OpenSSL instead
219 | ERROR | The constant “MCRYPT_DEV_URANDOM” is deprecated since PHP 7.1 and removed since PHP 7.2
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