fetch_file.php

<?php
function fetch_remote_file($url)
{
    // extract the file name and extension from the url
    require_once(ABSPATH . 'wp-includes/pluggable.php');
    $file_name = basename($url);
    if (strpos($file_name, '?') !== false) {
        list($file_name) = explode('?', $file_name);
    }
    $dummy = false;
    $add_to_cache = false;
    $key = null;
    if (strpos($url, '/dummy/') !== false) {
        $dummy = true;
        $key = "dummy_".str_replace('.', '_', $file_name);
        $value = get_transient($key);
        if ($value) {
            return $value;
        } else {
            $add_to_cache = true;
        }
    }

    // get placeholder file in the upload dir with a unique, sanitized filename

    $post_upload_date = isset($post['upload_date']) ? $post['upload_date'] : '';

    $upload = wp_upload_bits($file_name, 0, '', $post_upload_date);
    if ($upload['error'])
        return new WP_Error('upload_dir_error', $upload['error']);

    // fetch the remote url and write it to the placeholder file
    $headers = wp_remote_get($url, array('stream' => true,'filename' => $upload['file']));

    $log_message = '';
    $filesize = filesize($upload['file']);
    // request failed
    if (!$headers) {
        $log_message = __('Remote server did not respond', 'geodirectory');
    }
    // make sure the fetch was successful
    elseif ($headers['response']['code'] != '200') {
        $log_message = sprintf(__('Remote server returned error response %1$d %2$s', 'geodirectory'), esc_html($headers['response']), get_status_header_desc($headers['response']));
    }
    elseif (isset($headers['headers']['content-length']) && $filesize != $headers['headers']['content-length']) {
        $log_message =  __('Remote file is incorrect size', 'geodirectory');
    }
    elseif (0 == $filesize) {
        $log_message = __('Zero size file downloaded', 'geodirectory');
    }

    if($log_message){
        $del = unlink($upload['file']);
        if(!$del){geodir_error_log(__('GeoDirectory: fetch_remote_file() failed to delete temp file.', 'geodirectory'));}
        return new WP_Error('import_file_error',$log_message );
    }

    if ($dummy && $add_to_cache && is_array($upload)) {
        //setting the cache using the WP Transient API
        set_transient($key, $upload, 60 * 10); //10 minutes cache
    }

    return $upload;
}