Descargue la imagen de la URL y cárguela en la biblioteca de medios de WordPress

Estoy tratando de crear una función de WordPress que tome una URL de imagen, descargue la imagen, la cargue en la biblioteca de medios y devuelva la identificación de la imagen.

lo adapte de esta respuesta que era tomado de aquíy agregué wp_insertar_archivo adjunto() al final.

De momento no funciona porque no devuelve nada ni sube ningún medio.

Me cansé de depurar paso a paso con var_dump()y he descubierto la $url El parámetro se pasa correctamente, pero no se emite nada desde download_url.

¿Sabes lo que está mal?

¿Puedes ver algo más en la función que podría estar rota?

/* Add image to media library from URL and return the new image ID */
function bg_image_upload($url) {

  // Gives us access to the download_url() and wp_handle_sideload() functions
  require_once( ABSPATH . 'wp-admin/includes/file.php' );

  // Download file to temp dir
  $timeout_seconds = 10;
  $temp_file = download_url( $url, $timeout_seconds );

  if ( !is_wp_error( $temp_file ) ) {

      // Array based on $_FILE as seen in PHP file uploads
      $file = array(
          'name'     => basename($url), // ex: wp-header-logo.png
          'type'     => 'image/png',
          'tmp_name' => $temp_file,
          'error'    => 0,
          'size'     => filesize($temp_file),
      );

      $overrides = array(
          // Tells WordPress to not look for the POST form
          // fields that would normally be present as
          // we downloaded the file from a remote server, so there
          // will be no form fields
          // Default is true
          'test_form' => false,

          // Setting this to false lets WordPress allow empty files, not recommended
          // Default is true
          'test_size' => true,
      );

      // Move the temporary file into the uploads directory
      $results = wp_handle_sideload( $file, $overrides );

      if ( !empty( $results['error'] ) ) {
          // Insert any error handling here
      } else {

          $filename  = $results['file']; // Full path to the file
          $local_url = $results['url'];  // URL to the file in the uploads dir
          $type = $results['type']; // MIME type of the file
          $wp_upload_dir = wp_upload_dir(); // Get the path to the upload directory.

          $attachment = array (
            'post_title' => preg_replace( '/\.[^.]+$/', '', basename( $filename ) ),
            'post_mime_type' => $type,
            'post_status' => 'inherit',
            'post_content' => '',
          );

          $img_id = wp_insert_attachment( $attachment, $filename  );

          return $img_id;
      }
  }
}

100% trabajando este código

include_once( ABSPATH . 'wp-admin/includes/image.php' );
$imageurl="<IMAGE URL>";
$imagetype = end(explode("https://stackoverflow.com/", getimagesize($imageurl)['mime']));
$uniq_name = date('dmY').''.(int) microtime(true); 
$filename = $uniq_name.'.'.$imagetype;

$uploaddir = wp_upload_dir();
$uploadfile = $uploaddir['path'] . "https://stackoverflow.com/" . $filename;
$contents= file_get_contents($imageurl);
$savefile = fopen($uploadfile, 'w');
fwrite($savefile, $contents);
fclose($savefile);

$wp_filetype = wp_check_filetype(basename($filename), null );
$attachment = array(
    'post_mime_type' => $wp_filetype['type'],
    'post_title' => $filename,
    'post_content' => '',
    'post_status' => 'inherit'
);

$attach_id = wp_insert_attachment( $attachment, $uploadfile );
$imagenew = get_post( $attach_id );
$fullsizepath = get_attached_file( $imagenew->ID );
$attach_data = wp_generate_attachment_metadata( $attach_id, $fullsizepath );
wp_update_attachment_metadata( $attach_id, $attach_data ); 

echo $attach_id;

Código actualizado: cree cualquier archivo en el directorio raíz de su sitio web. y agregue el siguiente código. cambiar IMAGEURL con cualquier url de imagen.

<?php 
include( 'wp-load.php' );
include_once( ABSPATH . '/wp-admin/includes/image.php' );

$imageurl="IMAGEURL";
$imagetype = end(explode("https://stackoverflow.com/", getimagesize($imageurl)['mime']));
$uniq_name = date('dmY').''.(int) microtime(true); 
$filename = $uniq_name.'.'.$imagetype;

$uploaddir = wp_upload_dir();
$uploadfile = $uploaddir['path'] . "https://stackoverflow.com/" . $filename;
$contents= file_get_contents($imageurl);
$savefile = fopen($uploadfile, 'w');
fwrite($savefile, $contents);
fclose($savefile);

$wp_filetype = wp_check_filetype(basename($filename), null );
$attachment = array(
    'post_mime_type' => $wp_filetype['type'],
    'post_title' => $filename,
    'post_content' => '',
    'post_status' => 'inherit'
);

$attach_id = wp_insert_attachment( $attachment, $uploadfile );
$imagenew = get_post( $attach_id );
$fullsizepath = get_attached_file( $imagenew->ID );
$attach_data = wp_generate_attachment_metadata( $attach_id, $fullsizepath );
wp_update_attachment_metadata( $attach_id, $attach_data ); 

echo $attach_id;
 ?>