php7.0 compatibility?

php compatibility checker says this:

FILE: /wp-content/plugins/ninjafirewall/lib/firewall.php
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FOUND 12 ERRORS AFFECTING 12 LINES
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 362 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 363 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 368 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 376 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 627 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 641 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 642 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 645 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 715 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 716 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 717 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
 719 | ERROR | Global variable '$HTTP_RAW_POST_DATA' is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
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FILE: /wp-content/plugins/ninjafirewall/ninjafirewall.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 130 | WARNING | INI directive 'safe_mode' is deprecated since PHP 5.3 and removed since PHP 5.4

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