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understrap/inc/extras.php

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<?php
/**
* Custom functions that act independently of the theme templates.
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*
* Eventually, some of the functionality here could be replaced by core features.
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*
* @package understrap
*/
/**
* Adds custom classes to the array of body classes.
*
* @param array $classes Classes for the body element.
* @return array
*/
function understrap_body_classes( $classes ) {
// Adds a class of group-blog to blogs with more than 1 published author.
if ( is_multi_author() ) {
$classes[] = 'group-blog';
}
// Adds a class of hfeed to non-singular pages.
if ( ! is_singular() ) {
$classes[] = 'hfeed';
}
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return $classes;
}
add_filter( 'body_class', 'understrap_body_classes' );