在本例中（摘自Wrox book），如果single-category-$slug.php 文件存在，将显示，否则为single.php 文件但是如果每个帖子有多个类别（让我们考虑数组$templates 将包含多个结果），将$template包含我们在哪里使用此代码选择正确的slug？

<?php

add_filter( \'single_template\', \'boj_single_template\' );

function boj_single_template( $template ) {
    global $wp_query;

    /* Check if viewing a singular post. */
    if ( is_singular( \'post\' ) ) {

        /* Get the post ID. */
        $post_id = $wp_query->get_queried_object_id();

        /* Get the post categories. */
        $terms = get_the_terms( $post_id, \'category\' );

        /* Loop through the categories, adding slugs as part of the file name. */
        $templates = array();
        foreach ( $terms as $term )
            $templates[] = "single-category-{$term->slug}.php";

        /* Check if the template exists. */
        $locate = locate_template( $templates );

        /* If a template was found, make it the new template. */
        if ( !empty( $locate ) )
            $template = $locate;
    }

    /* Return the template file name. */
    return $template;
}

?>