Simple class to import jobs from Greenhouse.com API into WordPress

GreenhouseJobs.php

<?php


class GreenhouseJobs {


	public static function get_most_recent_jobs($how_many, $categories = NULL) {
		$all_jobs = static::get_jobs();

		$jobs = [];

		foreach($all_jobs->departments as $department) {
			foreach($department->jobs as $job) {
				$job->department = $department->name;
				$job->timestamp = (new DateTimeImmutable($job->updated_at))->getTimestamp();
				if($categories) {
					// Only add this job if the category is selected
					$index = array_search(trim($job->department), array_column($categories, 'post_title'));
	
					if($index !== FALSE) {
						$jobs[] = $job;
					}
				} else {
					// Add all jobs
					$jobs[] = $job;
				}
			}
		}

		// Order by reverse date order
		usort($jobs, function($a, $b) {
			return $b->timestamp <=> $a->timestamp;
		});

		$return_categories = [];

		foreach($jobs as $index => $job) {
			$existing_department = array_key_exists($job->department, $return_categories);

			if($existing_department === FALSE) {
				// New category array and add this job
				$return_categories[$job->department] = [$job];
			} else {
				// Add to existing array of jobs in this category
				$return_categories[$job->department][] = $job;
			}

			if($index == ($how_many - 1)) { // We have reached the number of jobs requested
				return $return_categories;
			}
		}


		return $return_categories;
	}
	

	public static function get_jobs() {
                // URL is public API endpoint, something like 
                // https://boards-api.greenhouse.io/v1/boards/wayve/departments
		$jobs = get_transient(GREENHOUSE_JOBS_URL); 

		if($jobs === FALSE) {
			// error_log('no data in cache');

			try {
				$json = static::load_jobs_from_api();

				$jobs = json_decode($json);

				if(is_object($jobs)) {
					error_log('Loaded jobs directly from API');

					set_transient(GREENHOUSE_JOBS_URL, $jobs, 10 * MINUTE_IN_SECONDS );
					static::update_job_categories($jobs);
				}


			} catch (Exception $e) {
				error_log($e);
			}

		}

		return $jobs;
	}



	private static function load_jobs_from_api() {
		$jobs = file_get_contents(GREENHOUSE_JOBS_URL);

		return $jobs;
	}


	private static function update_job_categories($jobs) {
		foreach($jobs->departments as $department) {
			static::update_job_category($department);
		}
	}


	private static function update_job_category($department) {
		// Does a department exist with this ID? 
		$category = get_posts(array(
		    'numberposts'   => 1,
		    'post_type'     => 'job_categories',
		    'meta_key'      => 'greenhouse_id',
		    'meta_value'    => $department->id,
		));

		if(empty($category)) {
			// Add new job category
			$new_category = array(
			    'post_type'     => 'job_categories',
			    'post_title'    =>  $department->name,
			    'post_status'   => 'publish',
			    'post_author'   => 1,
			);

			$category_id = wp_insert_post($new_category);
			update_field('greenhouse_id', $department->id, $category_id);
		} else {
			if($category[0]->post_title !== $department->name) {
				$category[0]->post_title = $department->name;
				wp_update_post($category[0]);
			}
		}

	}
  
}