Theme Review: post thumbnail, header image, content width

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A followup to my previous question about my theme that was rejected for the WordPress.org theme directory:

  • RECOMMENDED: No reference to the_post_thumbnail() was found in the theme. It is recommended that the theme implement this functionality instead of using custom fields for thumbnails.
  • RECOMMENDED: No reference to add_custom_image_header was found in the theme. It is recommended that the theme implement this functionality if using an image for the header.

How do I correct it? This is my function:

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// thumbnail list 
function retImage($content){
     $pattern="/<img.*?src=['|"](.*?(?:[.gif|.jpg]))['|"].*?[/]?>/";
     preg_match_all($pattern,$content,$match); 
     if(empty($match[0][0])){
                 echo "<img src="";
                 bloginfo('template_url');
                 echo "/images/thumbnail.png" />";
     }else{
         echo  $match[0][0];
     }
}

I used an image for the header by css, why do they say this:

  • RECOMMENDED: No reference to add_custom_image_header was found in the theme.

Header image CSS rules

  • Embedded videos overlap sidebar. Please set the content_width variable

In my the functions.php of my theme I did this: 

if ( ! isset( $content_width ) )
    $content_width = 992;

Why do they still give me that tip?

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1 comment

  1. RECOMMENDED: No reference to the_post_thumbnail() was found in the theme. It is recommended that the theme implement this functionality instead of using custom fields for thumbnails.

    This is because you are not using the_post_thumbnail() in your theme, you are trying to get an image from the post content. This means there is no way for a user to explicitly set which image is shown wherever you are using retImage(). I would include the ability for retImage() to try use the thumbnail, something like:

    // thumbnail list 
function retImage($content) {

    if( has_post_thumbnail() )
         return the_post_thumbnail( 'thumbnail' ); 

    $pattern="/<img.*?src=['|"](.*?(?:[.gif|.jpg]))['|"].*?[/]?>/";
    preg_match_all($pattern,$content,$match); 
    if(empty($match[0][0])){
             echo "<img src="";
             bloginfo('template_url');
             echo "/images/thumbnail.png" />";
    } else {

        echo  $match[0][0];
    }
}

    You may also need to include add_theme_support( 'post-thumbnails' ) in your functions.php

    RECOMMENDED: No reference to add_custom_image_header was found in the theme. It is recommended that the theme implement this functionality if using an image for the header.

    If you theme has a header image, it is recommended to use the WordPress header image API, you can find out more about it here: http://codex.wordpress.org/Function_Reference/add_custom_image_header

    This would enable the user to change the header image via the admin (Appearance -> Custom Header) or something alike.

    Embedded videos overlap sidebar. Please set the content_width variable
    The $content_width should be a global variable:

    global $content_width;
$content_width = 960;