embed.php: use modern PHP ?? operator

embed.php

@@ -9,8 +9,8 @@
 **/
 
 function wp_embed_handler_google_maps( $matches, $attr, $url, $rawattr ) {
-  $width = ($rawattr['width']) ? $rawattr['width'] : 425 ;
-  $height = ($rawattr['height']) ? $rawattr['height'] : 350 ;
+  $width = $rawattr['width'] ?? 425 ;
+  $height = $rawattr['height'] ?? 350 ;
   $query = add_query_arg(array('output' => 'embed'), $matches[0]);
   $embed = '<iframe width="'.esc_attr($width).'" height="'.esc_attr($height).'" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="'.esc_attr($query).'"></iframe>';
 
@@ -18,8 +18,8 @@ function wp_embed_handler_google_maps( $matches, $attr, $url, $rawattr ) {
 }
 
 function wp_embed_handler_openstreetmap( $matches, $attr, $url, $rawattr ) {
-  $width = ($rawattr['width']) ? $rawattr['width'] : 425 ;
-  $height = ($rawattr['height']) ? $rawattr['height'] : 350 ;
+  $width = $rawattr['width'] ?? 425 ;
+  $height = $rawattr['height'] ?? 350 ;
   $embed = '<iframe width="'.esc_attr($width).'" height="'.esc_attr($height).'" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="'.esc_attr($matches[0]).'"></iframe>';
 
   return apply_filters( 'embed_openstreetmap', $embed, $matches, $attr, $url, $rawattr );
@@ -59,8 +59,8 @@ function wp_embed_handler_archive( $matches, $attr, $url, $rawattr ) {
 }
 
 function wp_embed_handler_dctptv( $matches, $attr, $url, $rawattr ) {
-$width = ($attr['width']) ? $attr['width'] : 480 ;
-$height = ($attr['height']) ? $attr['height'] : 396 ;
+$width = $attr['width'] ?? 480 ;
+$height = $attr['height'] ?? 396 ;
 $embed= sprintf(
         '<iframe width="%3$s" scrolling="no" height="%2$s" frameborder="0" src="%1$s" name="dctp-embed" marginwidth="0" marginheight="0"><br>
 </iframe>',esc_attr($matches[0]),esc_attr($height),esc_attr($width));