PHP7 compatibility

Hi,

Is your plugin compatible with PHP7?

When using WP Engine’s plugin for scanning plugins for PHP7 compatibility, I am getting these warnings:

Name: MailPoet Newsletters

FILE: /nas/content/staging/xxxxxxxx/wp-content/plugins/wysija-newsletters/helpers/bounce.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 63 | WARNING | Function dl() is deprecated since PHP 5.3
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FILE: /nas/content/staging/xxxxxxxx/wp-content/plugins/wysija-newsletters/inc/pear/pear.php
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FOUND 0 ERRORS AND 5 WARNINGS AFFECTING 4 LINES
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 171 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
 740 | WARNING | INI directive 'safe_mode' is deprecated since PHP 5.3 and removed since PHP 5.4.
 754 | WARNING | Function dl() is deprecated since PHP 5.3
 754 | WARNING | Function dl() is deprecated since PHP 5.3
 852 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
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FILE: /nas/content/staging/xxxxxxxx/wp-content/plugins/wysija-newsletters/inc/phpmailer/class.phpmailer.php
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FOUND 7 ERRORS AND 1 WARNING AFFECTING 8 LINES
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  527 | WARNING | INI directive 'safe_mode' is deprecated since PHP 5.3 and removed since PHP 5.4.
 1358 | ERROR   | INI directive 'magic_quotes_runtime' is deprecated since PHP 5.3 and removed since PHP 5.4.
 1362 | ERROR   | INI directive 'magic_quotes_runtime' is deprecated since PHP 5.3 and removed since PHP 5.4.
 1785 | ERROR   | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found '$HTTP_SERVER_VARS'
 1786 | ERROR   | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found '$HTTP_ENV_VARS'
 1789 | ERROR   | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found '$HTTP_SERVER_VARS'
 1791 | ERROR   | The use of long predefined variables has been deprecated in 5.3 and removed in 5.4; Found '$HTTP_ENV_VARS'
 1879 | ERROR   | Function split() is deprecated since PHP 5.3 and removed since PHP 7.0; use preg_split instead
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FILE: /nas/content/staging/xxxxxxxx/wp-content/plugins/wysija-newsletters/controllers/back.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 207 | WARNING | Method name "WYSIJA_control_back::__setMetaTitle" is discouraged; PHP has reserved all method names with a double underscore prefix for future use
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FILE: /nas/content/staging/xxxxxxxx/wp-content/plugins/wysija-newsletters/views/back/campaigns.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 2359 | WARNING | Method name "WYSIJA_view_back_campaigns::__filterPostParent" is discouraged; PHP has reserved all method names with a double underscore prefix for future use
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