Compatibility with PHP 7.2?

I got the following results from the PHP Compatibility Checker. There are quite a few errors so I’m cautious about updating my PHP, but also concerned about upcoming end of life for PHP 5.6.

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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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222 | WARNING | Function each() is deprecated since PHP 7.2; Use a foreach loop instead
257 | WARNING | Function each() is deprecated since PHP 7.2; Use a foreach loop instead
313 | WARNING | Function each() is deprecated since PHP 7.2; Use a foreach loop instead
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FILE: /nas/content/live/oamain/wp-content/plugins/post-smtp/Postman/Postman-Mail/google-api-client/vendor/phpseclib/phpseclib/phpseclib/bootstrap.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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10 | WARNING | INI directive ‘mbstring.func_overload’ is deprecated since PHP 7.2
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FILE: /nas/content/live/oamain/wp-content/plugins/post-smtp/Postman/Postman-Mail/google-api-client/vendor/phpseclib/phpseclib/phpseclib/Crypt/Base.php
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FOUND 44 ERRORS AND 1 WARNING AFFECTING 25 LINES
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777 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
777 | ERROR | Function mcrypt_generic_init() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
810 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
810 | ERROR | Function mcrypt_generic_init() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
813 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
813 | ERROR | Function mcrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
818 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
818 | ERROR | Function mcrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
827 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
827 | ERROR | Function mcrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
837 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
837 | ERROR | Function mcrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
840 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
840 | ERROR | Function mcrypt_generic_init() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1089 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1089 | ERROR | Function mcrypt_generic_init() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1117 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1117 | ERROR | Function mcrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1122 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1122 | ERROR | Function mcrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1131 | ERROR | Function mdecrypt_generic() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1134 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1134 | ERROR | Function mcrypt_generic_init() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1596 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1596 | ERROR | Function mcrypt_list_algorithms() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1675 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1675 | ERROR | Function mcrypt_module_close() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1676 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1676 | ERROR | Function mcrypt_module_close() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1681 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1681 | ERROR | Function mcrypt_module_close() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1788 | ERROR | The constant “MCRYPT_MODE_ECB” is deprecated since PHP 7.1 and removed since PHP 7.2
1789 | ERROR | The constant “MCRYPT_MODE_CBC” is deprecated since PHP 7.1 and removed since PHP 7.2
1791 | ERROR | The constant “MCRYPT_MODE_NOFB” is deprecated since PHP 7.1 and removed since PHP 7.2
1792 | ERROR | The constant “MCRYPT_MODE_STREAM” is deprecated since PHP 7.1 and removed since PHP 7.2
1795 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1795 | ERROR | Function mcrypt_module_open() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1796 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1796 | ERROR | Function mcrypt_module_open() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1802 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1802 | ERROR | Function mcrypt_module_open() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
1802 | ERROR | The constant “MCRYPT_MODE_ECB” is deprecated since PHP 7.1 and removed since PHP 7.2
1807 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
1807 | ERROR | Function mcrypt_generic_init() is deprecated since PHP 7.1 and removed since PHP 7.2; Use OpenSSL instead
2500 | WARNING | Function create_function() is deprecated since PHP 7.2; Use an anonymous function instead
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FILE: /nas/content/live/oamain/wp-content/plugins/post-smtp/Postman/Postman-Mail/google-api-client/vendor/phpseclib/phpseclib/phpseclib/Crypt/Random.php
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FOUND 5 ERRORS AFFECTING 2 LINES
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69 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
69 | ERROR | Function mcrypt_create_iv() is deprecated since PHP 7.1 and removed since PHP 7.2; Use random_bytes() or OpenSSL instead
108 | ERROR | Extension ‘mcrypt’ is deprecated since PHP 7.1 and removed since PHP 7.2; Use openssl (preferred) or pecl/mcrypt once available instead
108 | ERROR | Function mcrypt_create_iv() is deprecated since PHP 7.1 and removed since PHP 7.2; Use random_bytes() or OpenSSL instead
108 | ERROR | The constant “MCRYPT_DEV_URANDOM” is deprecated since PHP 7.1 and removed since PHP 7.2
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