Your code is deprecated in latest version.
You should use this code to get the width:
$size = wc_get_image_size( 'shop_catalog' );
$placeholder_width = $size['width'];
Your code is deprecated in latest version.
You should use this code to get the width:
$size = wc_get_image_size( 'shop_catalog' );
$placeholder_width = $size['width'];