WordPress | Create a "Go Back" link based on what category the Project belongs to

project-go-back-link-based-on-category.php

<?php
add_shortcode( 'fs-project-go-back', 'fs_product_go_back_shortcode' );
function fs_product_go_back_shortcode( $atts ) {
	// begin output buffering
	ob_start();
  	// grab the terms of the product's attribute
	$project_cats = get_the_terms($post->ID, 'project_category');
	//$count = count($project_cats);
  
	echo '<div class="fs-project-go-back">';
  
		// if in a Project with any category
		if ( ! empty( $project_cats ) && ! is_wp_error( $project_cats ) ){
		
	  		/* instead of a foreach (incase it has multiple categories), this only grabs the first one... */
			reset($project_cats);  // make sure you are on first occ
			$project_cat = $project_cats[key($project_cats)];
	  
			/*
			foreach ( $project_cats as $project_cat ) {
				$project_cat_name = $project_cat->name;
				$project_cat_slug = $project_cat->slug;
			}
			*/

	  		$project_cat_name = $project_cat->name;
			$project_cat_slug = $project_cat->slug;
		  
			if ($project_cat_slug == 'association-non-profit') {
				$url = '/projects/associations-nonprofit/';
			}
			elseif ($project_cat_slug == 'corporate') {
				$url = '/projects/corporate/';
			}
			elseif ($project_cat_slug == 'law-firm') {
				$url = '/projects/law/';
			}
			elseif ($project_cat_slug == 'renovations-capital-improvements') {
				$url = '/projects/renovations-capital-improvements/';
			}
			else {
				$url = '/projects/all/';
			}
	  
			echo '<a href="'. $url .'"><img src="/wp-content/uploads/go-back-icon-02.png" alt="Go Back icon" title="Go Back"></a>';

		}
		// else not in a Project CPT
		else {
			echo '<a href="/projects/"><img src="/wp-content/uploads/go-back-icon-02.png" alt="Go Back icon" title="Go Back"></a>';
		}
  
  		echo '</div>';
  
	// end output buffering, grab the buffer contents, and empty the buffer
	return ob_get_clean();
}