Online PHP editor | output for l63LE

<?php $thumbs_meta = array( 'width' => 1024, 'height' => 768, 'file' => '2018/08/Penguins.jpg', 'sizes' => array( 'thumbnail' => array( 'file' => 'Penguins-150x150.jpg', 'width' => 150, 'height' => 150, 'mime-type' => 'image/jpeg' ), 'medium' => array( 'file' => 'Penguins-300x225.jpg', 'width' => 300, 'height' => 225, 'mime-type' => 'image/jpeg' ), 'medium_large' => array( 'file' => 'Penguins-768x576.jpg', 'width' => 768, 'height' => 576, 'mime-type' => 'image/jpeg' ), 'large' => array( 'file' => 'Penguins-1024x768.jpg', 'width' => 1024, 'height' => 768, 'mime-type' => 'image/jpeg' ), 'twentyseventeen-thumbnail-avatar' => array( 'file' => 'Penguins-100x100.jpg', 'width' => 100, 'height' => 100, 'mime-type' => 'image/jpeg' ) ) ); $thumbnail_files = array_column($thumbs_meta['sizes'], 'file'); var_export($thumbnail_files); echo "\nCount: " , count($thumbnail_files) , "\n\n"; echo "Imploded: " , implode(',', $thumbnail_files);