This plugin allows you to read class names in the tabs of your php files, which helps when you have the namespace set, and beforehand you only saw class.php's in the tabs.
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Using IDE built-in plugin system:
Preferences > Plugins > Marketplace > Search for "tab-as-class" > Install Plugin
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Manually:
Download the latest release and install it manually using Preferences > Plugins > ⚙️ > Install plugin from disk...