The following snippet will print out a list of the available thumbnail (featured image) sizes available in your current theme. Simple past the code below into a theme page and that specific page will print out the list. This is handy if you are trying to figure out the different image dimension options available to you in a theme.

print_r( $_wp_additional_image_sizes ); 
print '';

*Important: Due to a conflict displaying the code I had to remove the pre tag. Please replace the two blocks where it says “zzz” with “pre”.

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