adaptive featured images wordpress 4.4 grid

Since you can’t detect screen size using pure PHP, you have 2 choices.

1- Use JavaScript or jQuery to get the screen size and then fetch contents dynamically using Ajax/JSON. You can find a solution here.

2- Load all of the 3 sizes of the thumbnails, and then use CSS media queries to show the proper image size based on the visitor’s screen (only recommended on pages with low number of images).

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