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   Contributed by Codex — 3 years ago

   Default Usage
   To be used in the current theme’s functions.php file.

   function wpdocs_setup_theme() {
   	add_theme_support( 'post-thumbnails' );
   	set_post_thumbnail_size( 150, 150 );
   }
   add_action( 'after_setup_theme', 'wpdocs_setup_theme' );
   
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   Contributed by Codex — 3 years ago

   Crop Mode
   Set the default Post Thumbnail size by resizing the image proportionally (that is, without distorting it):

   set_post_thumbnail_size( 50, 50 ); // 50 pixels wide by 50 pixels tall, resize mode
   

   Set the default Post Thumbnail size by cropping the image (either from the sides, or from the top and bottom):

   set_post_thumbnail_size( 50, 50, true ); // 50 pixels wide by 50 pixels tall, crop mode
   

   Set the default Post Thumbnail size by cropping the image from top left:

   set_post_thumbnail_size( 50, 50, array( 'top', 'left')  ); // 50 pixels wide by 50 pixels tall, crop from the top left corner
   

   Set the default Post Thumbnail size by cropping the image from the center:

   set_post_thumbnail_size( 50, 50, array( 'center', 'center')  ); // 50 pixels wide by 50 pixels tall, crop from the center
   

   Note:
   This function will not resize your existing featured images. To regenerate existing images in the new size, use the Regenerate Thumbnails plugin.

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