Александр Токмаков

<style>
    .custom-1 {
    filter: invert(0.5);
    }
    .custom-2 {
    filter:  brightness(0) invert(1);
    }
    </style>
    <img src="https://s.cdpn.io/3/kiwi.svg" class="standard" width="50" height="50" alt="img">
    <img src="https://s.cdpn.io/3/kiwi.svg" class="custom-1" width="50" height="50" alt="img">
    <img src="https://s.cdpn.io/3/kiwi.svg" class="custom-2" width="50" height="50" alt="img">

spl_autoload_register(function ($class) {
    $file = str_replace('\\', '/', SITE_ROOT.'/classes/' .$class) . '.php';
    if(file_exists($file)) {
        require_once $file;
    } 
});

if (location.hash === '#nav-profile') {
                $('#nav-profile-tab').tab('show');
            }
            $('.nav-tabs .nav-link').on('shown.bs.tab', function (e) {
                window.location.hash = $(this).data('bs-target');
            })

add_action( 'init', 'custom_fix_thumbnail' );
  
function custom_fix_thumbnail() {
  add_filter('woocommerce_placeholder_img_src', 'custom_woocommerce_placeholder_img_src');
    
    function custom_woocommerce_placeholder_img_src( $src ) {
    $upload_dir = wp_upload_dir();
    $uploads = untrailingslashit( $upload_dir['baseurl'] );
    $src = $uploads . '/2015/08/default-image.jpg';
      
    return $src;
    }
}