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Testing image size filter for post editor

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PHP
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<?php
// test images
add_image_size( 'ducks', 350, 350, true );
add_image_size( 'cows', 750, 150, true );
 
 
//this function does not work and acts very wacky
function add_image_check(){
 
global $_wp_additional_image_sizes;
 
//default array
$default = array(
'thumbnail' => __('Thumbnail'),
'medium' => __('Medium'),
'large' => __('Large'),
'full' => __('Full Size')
);
//array from add_image_size
$new = $_wp_additional_image_sizes;
 
//merge the arrays
$result = array_merge($default, array_keys($new));
 
return $result;
};
 
add_filter('image_size_names_choose', 'add_image_check' );
 
//#########################################################
 
//this function works
function add_image_check_part2(){
 
global $_wp_additional_image_sizes;
 
//default array with hardcoded values fro add_image_size
$default = array(
'thumbnail' => __('Thumbnail'),
'medium' => __('Medium'),
'large' => __('Large'),
'full' => __('Full Size'),
'ducks' => __('Ducks'),
'cows' => __('Cows')
);
 
return $default
 
};
 
add_filter('image_size_names_choose', 'add_image_check_part2' );
 
 
 
 
?>

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