Problem dealing with images with no width specified

Great plugin!

I ran into a problem with some images in my posts that did not include a width tag. I’ve made a few modifications to hammy.php to deal with this case.

<?php
/*
Plugin Name: Hammy
Plugin URI: https://www.ads-software.com/extend/plugins/hammy/
Description: Creates adaptive images for your content area with breakpoints that you set.
Author: Noel Tock
Version: 1.3.2
Author URI: https://www.noeltock.com
*/

/**
 * Defines
 */
define ( 'HAMMY_VERSION', '1.3.2' );
define ( 'HAMMY_PATH',  WP_PLUGIN_URL . '/' . end( explode( DIRECTORY_SEPARATOR, dirname( __FILE__ ) ) ) );

/**
 * Register Default Settings
 */
if ( ! get_option('hammy_options') ) {
    register_activation_hook( __FILE__, 'hammy_defaults' );
}

function hammy_defaults() {

	global $content_width;

	if ( $content_width ) {

		$breakpoints = '';
		if ( $content_width >= 400 ) $breakpoints .= '320,';
		if ( $content_width >= 600 ) $breakpoints .= '480,';
		$breakpoints .= $content_width;

	} else {

		$breakpoints = '320,480,624';

	}

    $arr = array( 'hammy_breakpoints' => $breakpoints, 'hammy_ignores' => 'nextgen, thumbnail', 'hammy_parent' => '.entry-content', 'hammy_lazy' => 'false');
    update_option( 'hammy_options', $arr );

}

/**
 * Check for WPThumb, include.
 *
 */
if ( !function_exists( 'wpthumb' ) ) {
	include_once( 'WPThumb/wpthumb.php' );
}

/**
 * Plugin Options
 */
include_once( 'includes/options.php' );

add_action( 'admin_init', 'hammy_options_init' );
add_action( 'admin_menu', 'hammy_add_page' );

/**
 * Enqueue & Localize JavaScript & CSS ( TODO: find opportunity for minqueue)
 */
function load_hammy_js() {

	$options = get_option( 'hammy_options' );	

	if ( $options['hammy_lazy'] == 'true' ) {
		wp_enqueue_script( 'jquery-picture', HAMMY_PATH . '/js/jquery-picture-lazy.js', array( 'jquery' ), null, true );
		wp_enqueue_script( 'lazyload', HAMMY_PATH . '/js/jquery.lazyload.min.js', array( 'jquery' ), null, true );
		wp_enqueue_script( 'hammy', HAMMY_PATH . '/js/hammy-lazy.js', array( 'jquery' ), null, true  );
	} else {
		wp_enqueue_script( 'jquery-picture', HAMMY_PATH . '/js/jquery-picture.js', array( 'jquery' ), null, true );
		wp_enqueue_script( 'hammy', HAMMY_PATH . '/js/hammy.js', array( 'jquery' ), null, true  );
	}

    wp_localize_script( 'hammy', 'imageParent', $options['hammy_parent'] );

}

// TODO enqueue scripts

add_action( 'wp_print_scripts', 'load_hammy_js' );

function load_hammy_css() {

    wp_enqueue_style( 'hammy-css', HAMMY_PATH . '/css/hammy-admin.css' );

}

add_action( 'admin_print_styles', 'load_hammy_css' );

/**
 * Hammy Time
 *
 * @param $content
 * @return DOM element with fallback (<picture> -> <img>)
 */
function hammy_replace_images( $content ) {

	global $post;

	preg_match_all( '/<img (.*?)\/>/', $content, $images );

	if( !is_null( $images ) ) {

    	$options = get_option( 'hammy_options' );

        $ignoreClasses = explode( ",", $options['hammy_ignores'] );

        $ignorelist = '/' . implode( "|", $ignoreClasses ) . '/';

		foreach( $images[0] as $index => $value) {

			$doc = new DOMDocument();
			$doc->loadHTML( $value );
			$items = $doc->getElementsByTagName( 'img' );

			foreach( $items as $item ) {

				// Get Attributes

				$original = $item->getAttribute( 'src' );
				$width = $item->getAttribute( 'width' );
				if ($width > 0) {
					$class = $item->getAttribute( 'class' );
					$alt = $item->getAttribute( 'alt' );
					$title = $item->getAttribute( 'title' );

	                // Check if it's part of an ignored class

	                if ( ! preg_match( $ignorelist, $class ) ) {

	                    // Get Sizes

	                    $sizes = explode( ",", $options['hammy_breakpoints'] );

	                    // Render Sizes

	                    $breakpoint = null;

	                    // Output & Replace Strings

	                    $newimage = '<picture class="hammy-responsive ' . $class . '" alt="' . $alt . '" title="' . $title . '">';

	                    foreach ( $sizes as $size ) {

	                        if ( $breakpoint === null ) {

	                            $media = null;

	                        } else {

	                            $media = ' media="(min-width:' . $breakpoint . 'px)"';

	                        }

	                        if ( $size <= $width ) {

	                            $resized_image = wpthumb( $original, 'width=' . $size . '&crop=0' );

	                            $newimage .= '<source src="' . $resized_image . '"' . $media . '>';

	                        }

	                        $breakpoint = $size;

	                    }

	                    $newimage .= '<noscript><img src="' . $original . '" alt="' . $alt . '" title="' . $title . '"></noscript></picture>';

	                    $content = str_replace( $images[0][$index], $newimage, $content );
	                }

                }

			}

		}

	}

	return $content;

}

add_filter( 'the_content', 'hammy_replace_images', 999 );

?>

https://www.ads-software.com/plugins/hammy/