Example code

Step 1
XTRA

Modify single post featured image and post format HTML

In the following example you can see how to add attribute to the featured image.

XTRA

How and where should I add this PHP codes?

Best solution is to add custom actions and filters in Child Theme functions.php file. But also you can create your own plugin and use this codes in your plugin.

Developer

featuredfilterhookimagesingle

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