Hello, I have to update to PHP 7 and I ran a test to see if there would be any issues. The report says the following:

…plugins/wppizza/templates/wppizza-order-email-html.php
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FOUND 8 ERRORS AFFECTING 8 LINES
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42 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
167 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
171 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
176 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
181 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
186 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
190 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
195 | ERROR | The behaviour of hexadecimal numeric strings was inconsistent prior to PHP 7 and support has been removed in PHP 7. Found: ‘0x5’
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…plugins/wppizza/inc/common.helper.functions.inc.php
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FOUND 7 ERRORS AFFECTING 7 LINES
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115 | ERROR | preg_replace() – /e modifier is deprecated since PHP 5.5 and removed since PHP 7.0
255 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
257 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
261 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
264 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
265 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
268 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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…plugins/wppizza/inc/admin.system-info.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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61 | WARNING | INI directive ‘safe_mode’ is deprecated since PHP 5.3 and removed since PHP 5.4
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What are we supposed to do? Please help. Thanks!