Is there a way to downgrade php 5.5 to 5.3 in xampp? I searched on google but every one just tell me to uninstall xampp and install an older version. Could I have php 5.5 downgrade to 5.3 without reinstall xampp?
Short answer is no.
XAMPP is normally built around a specific PHP version to ensure plugins and modules are all compatible and working correctly.
If your project specifically needs PHP 5.3 - the cleanest method is simply reinstalling an older version of XAMPP with PHP 5.3 packaged into it.
XAMPP 1.7.7 was their last update before moving off PHP 5.3.