wp_iframe_tag_add_loading_attr( string $iframe, string $context ): string

Source

		// Validate the values after filtering.
		if ( isset( $optimization_attrs['loading'] ) && ! $filtered_loading_attr ) {
			// Unset `loading` attributes if `$filtered_loading_attr` is set to `false`.
			unset( $optimization_attrs['loading'] );
		} elseif ( in_array( $filtered_loading_attr, array( 'lazy', 'eager' ), true ) ) {
			/*
			 * If the filter changed the loading attribute to "lazy" when a fetchpriority attribute
			 * with value "high" is already present, trigger a warning since those two attribute
			 * values should be mutually exclusive.
			 *
			 * The same warning is present in `wp_get_loading_optimization_attributes()`, and here it
			 * is only intended for the specific scenario where the above filtered caused the problem.
			 */
			if ( isset( $optimization_attrs['fetchpriority'] ) && 'high' === $optimization_attrs['fetchpriority'] &&
				( isset( $optimization_attrs['loading'] ) ? $optimization_attrs['loading'] : false ) !== $filtered_loading_attr &&
				'lazy' === $filtered_loading_attr
			) {
				_doing_it_wrong(
					__FUNCTION__,
					__( 'An image should not be lazy-loaded and marked as high priority at the same time.' ),
					'6.3.0'
				);
			}

			// The filtered value will still be respected.
			$optimization_attrs['loading'] = $filtered_loading_attr;
		}

		if ( ! empty( $optimization_attrs['loading'] ) ) {
			$image = str_replace( '<img', '<img loading="' . esc_attr( $optimization_attrs['loading'] ) . '"', $image );
		}
	}

	if ( empty( $fetchpriority_val ) && ! empty( $optimization_attrs['fetchpriority'] ) ) {
		$image = str_replace( '<img', '<img fetchpriority="' . esc_attr( $optimization_attrs['fetchpriority'] ) . '"', $image );
	}

	return $image;
}

/**
 * Adds `width` and `height` attributes to an `img` HTML tag.
 *
 * @since 5.5.0
 *
 * @param string $image         The HTML `img` tag where the attribute should be added.
 * @param string $context       Additional context to pass to the filters.
 * @param int    $attachment_id Image attachment ID.
 * @return string Converted 'img' element with 'width' and 'height' attributes added.
 */
function wp_img_tag_add_width_and_height_attr( $image, $context, $attachment_id ) {
	$image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
	list( $image_src ) = explode( '?', $image_src );

	// Return early if we couldn't get the image source.
	if ( ! $image_src ) {
		return $image;
	}

	/**
	 * Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.

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