+/**
+ * Returns the upload quota for the current blog.
+ *
+ * @since MU
+ *
+ * @return int Quota in megabytes
+ */
+function get_space_allowed() {
+ $space_allowed = get_option( 'blog_upload_space' );
+
+ if ( ! is_numeric( $space_allowed ) )
+ $space_allowed = get_site_option( 'blog_upload_space' );
+
+ if ( empty( $space_allowed ) || ! is_numeric( $space_allowed ) )
+ $space_allowed = 50;
+
+ return $space_allowed;
+}
+
+/**
+ * Determines if there is any upload space left in the current blog's quota.
+ *
+ * @since 3.0.0
+ *
+ * @return int of upload space available in bytes
+ */
+function get_upload_space_available() {
+ $space_allowed = get_space_allowed() * 1024 * 1024;
+ if ( get_site_option( 'upload_space_check_disabled' ) )
+ return $space_allowed;
+
+ $space_used = get_space_used() * 1024 * 1024;
+
+ if ( ( $space_allowed - $space_used ) <= 0 )
+ return 0;
+
+ return $space_allowed - $space_used;
+}
+
+/**
+ * Determines if there is any upload space left in the current blog's quota.
+ *
+ * @since 3.0.0
+ * @return bool True if space is available, false otherwise.
+ */
+function is_upload_space_available() {
+ if ( get_site_option( 'upload_space_check_disabled' ) )
+ return true;
+
+ return (bool) get_upload_space_available();
+}
+
+/**
+ * @since 3.0.0
+ *
+ * @return int of upload size limit in bytes
+ */
+function upload_size_limit_filter( $size ) {
+ $fileupload_maxk = 1024 * get_site_option( 'fileupload_maxk', 1500 );
+ if ( get_site_option( 'upload_space_check_disabled' ) )
+ return min( $size, $fileupload_maxk );
+
+ return min( $size, $fileupload_maxk, get_upload_space_available() );
+}
+
+/**
+ * Whether or not we have a large network.
+ *
+ * The default criteria for a large network is either more than 10,000 users or more than 10,000 sites.
+ * Plugins can alter this criteria using the 'wp_is_large_network' filter.
+ *
+ * @since 3.3.0
+ * @param string $using 'sites or 'users'. Default is 'sites'.
+ * @return bool True if the network meets the criteria for large. False otherwise.
+ */
+function wp_is_large_network( $using = 'sites' ) {
+ if ( 'users' == $using ) {
+ $count = get_user_count();
+ return apply_filters( 'wp_is_large_network', $count > 10000, 'users', $count );
+ }
+
+ $count = get_blog_count();
+ return apply_filters( 'wp_is_large_network', $count > 10000, 'sites', $count );
+}