wp_attachment_is_image( int|WP_Post $post = null ): bool

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   Codex 9 years ago

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   Basic Example

   To check if post ID 37’s attachment is an image:

   $id = 37;
   if ( wp_attachment_is_image( $id ) ) {
   	printf( 'Post %d is an image!', $id );
   } else {
   	printf( 'Post %d is not an image.', $id );
   }

   Edited with a contribution from @keraweb