WordPress scripts for functions.php file

wp-print-vars-in-footer-admin-only.php

<?php

/**
 * [cds_add_to_footer description]
 * DEBUG - output to footer only for logged-in admins
 * @return [type] [description]
 */
function cds_add_to_footer(){ 
    
    // Don't display for non-admin users
    if ( ! current_user_can( 'manage_options' ) )
        return;
        
	// wp globals
	// global $wp_rewrite;
    // global $post;
    
	//#1
	if (is_single() ) {
        global $post;
        
        $categories = array();
        $category_nicknames = array();
        foreach((get_the_category($post->ID)) as $category) {
            $categories[] = $category;
            // add category slug to the $category_nicknames array
            $category_nicknames[] = $category->category_nicename;
        }
        
        echo '<div class="cds debug" style="
		    background: #f1f1f1;
		    border: 3px solid black;
		    position: relative;
		    padding:  20px;
		">';

			highlight_string("\n<?php\n\$categories =\n" . var_export($categories, true) . ";\n?>");
			highlight_string("\n<?php\n\$category_nicknames =\n" . var_export($category_nicknames, true) . ";\n?>");

		echo '</div><!-- /.cds.debug -->';
    }

}
add_action('wp_footer','cds_add_to_footer');