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After PHP compatibility test with PHP Compatibility Checker WordPress plugin, I got following errors below. How to fix them so I could update my PHP version? Thank you
FILE: /wp-content/plugins/swift-performance-lite/includes/setup/setup.php
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FOUND 1 ERROR AND 1 WARNING AFFECTING 2 LINES
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294 | WARNING | INI directive ‘safe_mode’ is deprecated since PHP 5.3 and removed since PHP 5.4
398 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE: /wp-content/plugins/swift-performance-lite/includes/cache-status/cache-status.php
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FOUND 1 ERROR AFFECTING 1 LINE
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74 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE: /wp-content/plugins/swift-performance-lite/performance.php
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FOUND 4 ERRORS AFFECTING 4 LINES
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600 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
726 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
2048 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
2068 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE: /wp-content/plugins/swift-performance-lite/modules/cache/cache.php
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FOUND 5 ERRORS AFFECTING 5 LINES
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272 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
312 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
758 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
829 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
1060 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE: /wp-content/plugins/swift-performance-lite/modules/image-optimizer/image-optimizer.php
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FOUND 1 ERROR AFFECTING 1 LINE
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685 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
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FILE:/wp-content/plugins/swift-performance-lite/modules/asset-manager/asset-manager.php
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FOUND 2 ERRORS AFFECTING 2 LINES
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163 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead
180 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0; Use mysqli instead