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   Contributed by markcallen — 2 years ago

   In the get_image_sizes() example above – note that since WordPress 4.4 there is a new size – ‘medium_large’.

   Include that in the array on line 13 to prevent errors.
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   Contributed by Codex — 3 years ago

   List available image sizes with width and height following

   /**
    * Get information about available image sizes
    */
   function get_image_sizes( $size = '' ) {
   
   	global $_wp_additional_image_sizes;
   
   	$sizes = array();
   	$get_intermediate_image_sizes = get_intermediate_image_sizes();
   
   	// Create the full array with sizes and crop info
   	foreach( $get_intermediate_image_sizes as $_size ) {
   		if ( in_array( $_size, array( 'thumbnail', 'medium', 'large' ) ) ) {
   			$sizes[ $_size ]['width'] = get_option( $_size . '_size_w' );
   			$sizes[ $_size ]['height'] = get_option( $_size . '_size_h' );
   			$sizes[ $_size ]['crop'] = (bool) get_option( $_size . '_crop' );
   		} elseif ( isset( $_wp_additional_image_sizes[ $_size ] ) ) {
   			$sizes[ $_size ] = array( 
   				'width' => $_wp_additional_image_sizes[ $_size ]['width'],
   				'height' => $_wp_additional_image_sizes[ $_size ]['height'],
   				'crop' =>  $_wp_additional_image_sizes[ $_size ]['crop']
   			);
   		}
   	}
   
   	// Get only 1 size if found
   	if ( $size ) {
   		if( isset( $sizes[ $size ] ) ) {
   			return $sizes[ $size ];
   		} else {
   			return false;
   		}
   	}
   	return $sizes;
   }
   
   

   Expand full source codeCollapse full source code

   Some examples of use of this function:

   var_dump( get_image_sizes() );
   /*
   array(4) {
     ["thumbnail"]=>
     array(3) {
       ["width"]=>
       string(3) "150"
       ["height"]=>
       string(3) "150"
       ["crop"]=>
       bool(true)
     }
     ["medium"]=>
     array(3) {
       ["width"]=>
       string(3) "300"
       ["height"]=>
       string(3) "300"
       ["crop"]=>
       bool(false)
     }
     ["large"]=>
     array(3) {
       ["width"]=>
       string(4) "1024"
       ["height"]=>
       string(4) "1024"
       ["crop"]=>
       bool(false)
     }
     ["juliobox-size"]=>
     array(3) {
       ["width"]=>
       int(211)
       ["height"]=>
       int(279)
       ["crop"]=>
       bool(false)
     }
   }
   */
   
   var_dump( get_image_sizes( 'large' ) );
   /*
   array(3) {
     ["width"]=>
     int(1024)
     ["height"]=>
     int(1024)
     ["crop"]=>
     bool(false)
   }
   */
   
   var_dump( get_image_sizes( 'foo-bar' ) );
   /*
   bool(false)
   */
   
   

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