Rhye theme: disable JS lazy loading

<?php

// Disable theme lazy images by swapping [data-*] attributes with the original image attributes
function filter_disable_lazy_images( $buffer ) {
    libxml_use_internal_errors( true );
    $document = new DOMDocument();
    $document->loadHTML( mb_convert_encoding( $buffer, 'HTML-ENTITIES', 'UTF-8' ) );
    $lazy_images = $document->getElementsByTagName( 'img' );

    foreach ( $lazy_images as $image ) {
        $src    = $image->getAttribute( 'data-src' );
        $srcset = $image->getAttribute( 'data-srcset' );
        $sizes  = $image->getAttribute( 'data-sizes' );

        if ( ! empty( $src ) ) {
            $image->setAttribute( 'src', $src );
            $image->removeAttribute( 'data-src' );
            $image->setAttribute( 'loading', 'lazy' );
        }

        if ( ! empty( $srcset ) ) {
            $image->setAttribute( 'srcset', $srcset );
            $image->removeAttribute( 'data-srcset' );
        }

        if ( ! empty( $sizes ) ) {
            $image->setAttribute( 'sizes', $sizes );
            $image->removeAttribute( 'data-sizes' );
        }
    };

    return $document->saveHTML();
}

function buffer_start() {
    ob_start( 'filter_disable_lazy_images' );
}

function buffer_end() {
    ob_end_flush();
}

add_action( 'wp_head', 'buffer_start' );
add_action( 'wp_footer', 'buffer_end' );