Wordpress if语句没有回显正确的URI

Question

I have created an if statement to check if the current wordpress page/post has a feature image set. If it does not I want the script to echo the URI for the placeholder image. The script run's without any PHP errors however when no feature image is available it echos the following background: url(h) and not the URI for the placeholder. I can see the issue is with the inline echoing $image[0] however I don't know how to fix this.

  <?php if(is_home()) {
      $image = wp_get_attachment_image_src(get_post_thumbnail_id(get_option('page_for_posts')),'full');
    } elseif (has_post_thumbnail($post->ID)) {
      $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail, page_for_posts' );
    } else {
      $image = get_template_directory_uri() . '/assets/images/placeholder.png';
    }
  ?>

  <div class="hero-inner" style="background: url(<?php echo $image[0]; ?>) no-repeat center center; background-size: cover;">
     [...] 
  </div>

Answer 1

if(is_home()) {
      $image = wp_get_attachment_image_src(get_post_thumbnail_id(get_option('page_for_posts')),'full');
    } elseif (has_post_thumbnail($post->ID)) {
      $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail, page_for_posts' );
    } 

    if($image){
        $image = $image[0];
        }
            else {
      $image = get_template_directory_uri() . '/assets/images/placeholder.png';
    }
  ?>

  <div class="hero-inner" style="background: url(<?php echo $image; ?>) no-repeat center center; background-size: cover;">
     [...] 
  </div>