php compatibility

FILE: /home/lebensma/nlppni.com/wp-content/plugins/ninjafirewall/lib/firewall.php
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FOUND 12 ERRORS AFFECTING 12 LINES
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250 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
251 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
256 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
264 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
759 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
773 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
774 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
777 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
881 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
882 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
883 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
885 | ERROR | Global variable ‘$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: /home/lebensma/nlppni.com/wp-content/plugins/ninjafirewall/lib/utils.php
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FOUND 2 ERRORS AND 3 WARNINGS AFFECTING 5 LINES
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239 | ERROR | Since PHP 7.0, functions inspecting arguments, like debug_backtrace(), no longer report the original value as passed to a parameter, but will instead provide the current value. The parameter “$postarr” was changed on line 192.
318 | WARNING | Since PHP 7.0, functions inspecting arguments, like debug_backtrace(), no longer report the original value as passed to a parameter, but will instead provide the current value. The parameter “$post” was used, and possibly changed (by reference), on line 277.
434 | WARNING | Since PHP 7.0, functions inspecting arguments, like debug_backtrace(), no longer report the original value as passed to a parameter, but will instead provide the current value. The parameter “$user_login” was used, and possibly changed (by reference), on line 408.
1268 | ERROR | Since PHP 7.0, functions inspecting arguments, like debug_backtrace(), no longer report the original value as passed to a parameter, but will instead provide the current value. The parameter “$key” was changed on line 1206.
1515 | WARNING | Since PHP 7.0, functions inspecting arguments, like debug_backtrace(), no longer report the original value as passed to a parameter, but will instead provide the current value. The parameter “$type” was used, and possibly changed (by reference), on line 1493.
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I found these problems with a php compatibility checker. I would really continue to use it – the checker suggests not to. could you please?

FILE: /home/lebensma/nlppni.com/wp-content/plugins/ninjafirewall/ninjafirewall.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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157 | WARNING | INI directive ‘safe_mode’ is deprecated since PHP 5.3 and removed since PHP 5.4
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