Download and replace images in a text

download.php

function id_replace_images($content) {
	$dom = new domDocument;
	$dom->loadHTML('<?xml encoding="UTF-8">' . $content, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

	// dirty fix
	foreach ($dom->childNodes as $elem)
	    if ($elem->nodeType == XML_PI_NODE)
	        $dom->removeChild($elem); // remove hack
	$dom->encoding = 'UTF-8'; // insert proper

	$dom->preserveWhiteSpace = false;
	$images = $dom->getElementsByTagName('img');
	foreach ($images as $key => $image) {

	  	$src = $image->getAttribute('src');
	  	$img =  trailingslashit( dirname(__FILE__) ) . '../' . $src;

		$img_id = null;

		if( !$img_id = id_get_image($img) ) {
			$img_id = id_image($img);
		}

		if( $img_id ) {
			$min_width = 1500;


			$img = wp_get_attachment_image_src( $img_id, 'full' );
			if( $img[1] > $min_width ) {
				$src = anuna_img(home_url($img[0]), 'type=input&width=1500&height=99999&upscale=false&crop=false&echo=false&output=src&post_id=null');
				$src = str_replace(home_url(), '', $src);
			}
			else {
				$src = $img[0];
			}
			$image->setAttribute('src', $src);
		}
		else {
			$image->parentNode->removeChild($image);
		}
	}

	return $dom->saveHTML();
}

function id_get_image( $url ) {

	$name = sanitize_file_name(basename($url));

	global $wpdb;

	$query = "SELECT ID FROM {$wpdb->posts} WHERE post_type = 'attachment' AND guid LIKE '%/{$name}' LIMIT 1";

	return $wpdb->get_var($query);

}

function id_image( $path ) {
	
	if(!file_exists($path))
		return;

	require_once(ABSPATH . 'wp-admin/includes/media.php');
	require_once(ABSPATH . 'wp-admin/includes/file.php');
	require_once(ABSPATH . 'wp-admin/includes/image.php');

    $file_array = array(
        'name' => basename( $path ),
        'tmp_name' => $path
    );

    $id = media_handle_sideload( $file_array, 0 );

    // Check for handle sideload errors.
    if ( is_wp_error( $id ) ) {
        return $id;
    }

    return $id;
}