Great stuff @errorsys!
I also checked it with a PHP7 Compatibility Plugin and this was the output:
FILE: /home/mysite/public_html/wp-content/plugins/db-cache-reloaded-fix/db-functions.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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54 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
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FILE: /home/mysite/public_html/wp-content/plugins/db-cache-reloaded-fix/db-module.php
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FOUND 9 ERRORS AFFECTING 9 LINES
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214 | ERROR | Assigning the return value of new by reference is deprecated in PHP 5.3 and forbidden in PHP 7.0
411 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
421 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
427 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
430 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
440 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
441 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
445 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
450 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE: /home/mysite/public_html/wp-content/plugins/db-cache-reloaded-fix/db-cache-reloaded.php
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FOUND 1 ERROR AND 1 WARNING AFFECTING 2 LINES
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73 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
91 | ERROR | Assigning the return value of new by reference is deprecated in PHP 5.3 and forbidden in PHP 7.0
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FILE: /home/mysite/public_html/wp-content/plugins/db-cache-reloaded-fix/db-module-wrapper.php
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FOUND 1 ERROR AFFECTING 1 LINE
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105 | ERROR | Assigning the return value of new by reference is deprecated in PHP 5.3 and forbidden in PHP 7.0
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I wonder that if for people who know PHP a little better than I do, these could all be easy fixes?