Wordpress - How to get a list of all the possible thumbnail sizes set within a theme
Found it here. The answer is:
global $_wp_additional_image_sizes;
print '<pre>';
print_r( $_wp_additional_image_sizes );
print '</pre>';
WordPress core doesn't have a native method for getting intermediate image sizes (i.e. width and height), but the following helper function will get all registered image sizes along with their dimensions:
/**
* Get all the registered image sizes along with their dimensions
*
* @global array $_wp_additional_image_sizes
*
* @link http://core.trac.wordpress.org/ticket/18947 Reference ticket
*
* @return array $image_sizes The image sizes
*/
function _get_all_image_sizes() {
global $_wp_additional_image_sizes;
$default_image_sizes = get_intermediate_image_sizes();
foreach ( $default_image_sizes as $size ) {
$image_sizes[ $size ][ 'width' ] = intval( get_option( "{$size}_size_w" ) );
$image_sizes[ $size ][ 'height' ] = intval( get_option( "{$size}_size_h" ) );
$image_sizes[ $size ][ 'crop' ] = get_option( "{$size}_crop" ) ? get_option( "{$size}_crop" ) : false;
}
if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) ) {
$image_sizes = array_merge( $image_sizes, $_wp_additional_image_sizes );
}
return $image_sizes;
}
Which will output results similar to:
Array
(
[thumbnail] => Array
(
[width] => 150
[height] => 150
[crop] => 1
)
[medium] => Array
(
[width] => 300
[height] => 300
[crop] =>
)
[medium_large] => Array
(
[width] => 768
[height] => 0
[crop] =>
)
[large] => Array
(
[width] => 1024
[height] => 1024
[crop] =>
)
)
If you only need the names of all image sizes, you can use get_intermediate_image_sizes:
<pre>
<?php print_r(get_intermediate_image_sizes()); ?>
</pre>