base.php

    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.isotope/3.0.2/isotope.pkgd.js"></script>
    <script src="https://unpkg.com/imagesloaded@4/imagesloaded.pkgd.min.js"></script>

Isotope+Imageload.js

var $grid = $('.grid').isotope({
	itemSelector: '.grid-item',
	masonry: {
		horizontalOrder: true,
	}
});
        
$grid.imagesLoaded().progress(function() {
	$grid.isotope('layout');
});