How to give particular image size for the `_post_thumbnail()` function in wordpress?

2 comments

1. You can use

         the_post_thumbnail('thumbnail'); 
         the_post_thumbnail('medium');        
         the_post_thumbnail('large');          
         the_post_thumbnail('full');           
   
         the_post_thumbnail( array(100,100) );
   

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2. you can use any of the above mentioned and can also use add_image_size function to define a new size with crop feature in yout theme function file, refer to http://codex.wordpress.org/Function_Reference/add_image_size.
   you might have problem with crop for images already uploaded, but after adding image size in theme functions.php file you need to upload images to crop them accordingly.

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