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$upload_dir = wp_upload_dir();
$image_data = file_get_contents($image_url);
$filename = basename($image_url);
if(wp_mkdir_p($upload_dir['path']))
	$file = $upload_dir['path'] . '/' . $filename;
else
	$file = $upload_dir['basedir'] . '/' . $filename;
 
file_put_contents($file, $image_data);
$wp_filetype = wp_check_filetype($filename, null );
$attachment = array(
	'post_mime_type' => $wp_filetype['type'],
	'post_title' => sanitize_file_name($filename),
	'post_content' => '',
	'post_status' => 'inherit'
);
$attach_id = wp_insert_attachment( $attachment, $file, $post_id );
require_once(ABSPATH . 'wp-admin/includes/image.php');
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );
wp_update_attachment_metadata( $attach_id, $attach_data );
// Ponemos la imagen como THUMBNAIL
set_post_thumbnail( $post_id, $attach_id );

$upload_dir = wp_upload_dir(); $image_data = file_get_contents($image_url); $filename = basename($image_url); if(wp_mkdir_p($upload_dir['path'])) $file = $upload_dir['path'] . '/' . $filename; else $file = $upload_dir['basedir'] . '/' . $filename; file_put_contents($file, $image_data); $wp_filetype = wp_check_filetype($filename, null ); $attachment = array( 'post_mime_type' => $wp_filetype['type'], 'post_title' => sanitize_file_name($filename), 'post_content' => '', 'post_status' => 'inherit' ); $attach_id = wp_insert_attachment( $attachment, $file, $post_id ); require_once(ABSPATH . 'wp-admin/includes/image.php'); $attach_data = wp_generate_attachment_metadata( $attach_id, $file ); wp_update_attachment_metadata( $attach_id, $attach_data ); // Ponemos la imagen como THUMBNAIL set_post_thumbnail( $post_id, $attach_id );