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Editing: images.php

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<?php
defined( 'ABSPATH' ) || die( 'Cheatin&#8217; uh?' );

/**
 * Add width and height attributes on all images
 *
 * @since 2.2.2 This feature is enabled by a hook
 * @since 1.3.0 This process is called via the new filter rocket_buffer
 * @since 1.3.0 It's possible to not specify dimensions of an image with data-no-image-dimensions attribute
 * @since 1.1.2 Fix Bug : No conflit with Photon Plugin (Jetpack)
 * @since 1.1.0
 *
 * @param string $buffer HTML content.
 * @return string Modified HTML content
 */
function rocket_specify_image_dimensions( $buffer ) {
	/**
	 * Filter images dimensions attributes
	 *
	 * @since 2.2
	 *
	 * @param bool Do the job or not.
	 */
	if ( ! apply_filters( 'rocket_specify_image_dimensions', false ) ) {
		return $buffer;
	}

// Get all images without width or height attribute.
	preg_match_all( '/<img(?:[^>](?!(height|width)=))*+>/i' , $buffer, $images_match );

foreach ( $images_match[0] as $image ) {

// Don't touch lazy-load file (no conflit with Photon (Jetpack)).
		if ( strpos( $image, 'data-lazy-original' ) || strpos( $image, 'data-no-image-dimensions' ) ) {
			continue;
		}

$tmp = $image;

// Get link of the file.
		preg_match( '/src=[\'"]([^\'"]+)/', $image, $src_match );

// Get infos of the URL.
		$image_url = wp_parse_url( $src_match[1] );

// Check if the link isn't external.
		if ( empty( $image_url['host'] ) || rocket_remove_url_protocol( home_url() ) === $image_url['host'] ) {
			// Get image attributes.
			$sizes = getimagesize( ABSPATH . $image_url['path'] );
		} else {
			/**
			 * Filter distant images dimensions attributes
			 *
			 * @since 2.2
			 *
			 * @param bool Do the job or not
			 */
			if ( ini_get( 'allow_url_fopen' ) && apply_filters( 'rocket_specify_image_dimensions_for_distant', false ) ) {
				// Get image attributes.
				$sizes = getimagesize( $image_url['scheme'] . '://' . $image_url['host'] . $image_url['path'] );
			}
		}

if ( ! empty( $sizes ) ) {
			// Add width and width attribute.
			$image = str_replace( '<img', '<img ' . $sizes[3], $image );

// Replace image with new attributes.
			$buffer = str_replace( $tmp, $image, $buffer );
		}
	}

return $buffer;
}
add_filter( 'rocket_buffer', 'rocket_specify_image_dimensions', 10 );

Editing: images.php

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