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I used Xdebug for debugging in PHP v7. The way I did that its not working for PHP version 5.3.8.
From the https://xdebug.org/wizard.php page, when I paste phpinfo() text it shows error:
The compiler (MS VC9) that this PHP was build with, is no longer supported. Please upgrade to a version that was built with MS VC11 or MS VC14.
How to debug using PHP v5.3.8
Download an older version for the matching PHP version: https://xdebug.org/download.php.
They may not be supported anymore, but old versions continue to work as they did when they were still actively supported.