Wordpress PHP Featured Image

Wordpress PHP Featured Images.php

<?php
// Wordpress PHP Featured Images Overview

// Next, I should add support for featured images
// http://codex.wordpress.org/Post_Thumbnails

// In order to use such images, I need to add a few things to the functions.php file

///First, I have to add 
	add_theme_support( 'post-thumbnails' );  
// just to enable featured images

// If I just want to show the images in their full size, then I do like so:
	 the_post_thumbnail( 'full', array('class' => 'gameimage') ); 	
	
//To add multiple featured image sizes I can do like this: http://codex.wordpress.org/Function_Reference/add_image_size
// I would add as many sizes as I wanted to my functions file:

add_image_size( 'main-category-thumb', 280, 280, true ); 

add_image_size( 'small-category-thumb', 180, 180, true );

add_image_size( 'single-page-thumb', 180, 180, true );


// Here's how I check to see if a post has a thumbnail (if it does I post said thumbnail, if not then I post a default image or can post nothing)

	if ( has_post_thumbnail() ) { 
				the_post_thumbnail('main-category-thumb' );
						} else {		?>					
				<img src="<?php bloginfo('template_directory'); ?>/images/placeholder-android-image.jpg" />
		 }  
// be sure to paste the above in the loop

		?>