includes/managers/class-fs-cache-manager.php
function has( $key ) {
            $cache_entry = $this->_options->get_option( $key, false );

            return ( is_object( $cache_entry ) &&
                     isset( $cache_entry->timestamp ) &&
                     is_numeric( $cache_entry->timestamp )
            );
        }
function has( $key ) {
            $cache_entry = $this->_options->get_option( $key, false );

            return ( is_object( $cache_entry ) &&
                     isset( $cache_entry->timestamp ) &&
                     is_numeric( $cache_entry->timestamp )
            );
        }
function has ( $ key ) { $ cache_entry = $ this -> _options -> get_option ( $ key , false ) ; return ( is_object ( $ cache_entry ) && isset ( $ cache_entry -> timestamp ) && is_numeric ( $ cache_entry -> timestamp ) ) ; }
Check if there's a cached item.

@author Vova Feldman (@svovaf)
@since  1.1.6

@param string $key

@return bool
Check if there s a cached item .