functions.php

<?php 
//
// Order search results by post_date
//
function my_search_query( $query ) {
	// not an admin page and is the main query
	if ( !is_admin() && $query->is_main_query() ) {
		if ( is_search() ) {
			$query->set( 'orderby', 'post_date' );
			$query->set( 'order', 'DESC' );
		}
	}
}
add_action( 'pre_get_posts', 'my_search_query' );

function neag_scripts() {
	wp_enqueue_style( 'neag-style', get_stylesheet_directory_uri() . '/css/neag.css');
	wp_enqueue_script('neag-custom', get_stylesheet_directory_uri().'/js/custom.js', array('jquery', 'cs'));
	wp_localize_script( 'neag-custom', 'neag_object', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ), 'siteurl' => site_url() ) );
	wp_enqueue_style( 'neag-print', get_stylesheet_directory_uri() .'/css/print.css', array( 'neag-style' ), false, 'print');
}
add_action( 'wp_enqueue_scripts', 'neag_scripts');


if ( function_exists('register_sidebar') ) {
	register_sidebar( array(
		'name'         => __( 'Header - Social Media' ),
		'id'           => 'header',
		'description'  => __( 'Widgets in this area will be shown in the header.' ),
		'before_title' => '<h1>',
		'after_title'  => '</h1>',
	) );
	
	register_sidebar( array(
		'name'         => __( 'Footer - Left' ),
		'id'           => 'footer-left',
		'description'  => __( 'Widgets in this area will be shown on the left hand side of the footer.' ),
		'before_title' => '<h1>',
		'after_title'  => '</h1>',
	) );
	
	register_sidebar( array(
		'name'         => __( 'Footer - Center' ),
		'id'           => 'footer-center',
		'description'  => __( 'Widgets in this area will be shown on the right hand side of the footer.' ),
		'before_title' => '<h1>',
		'after_title'  => '</h1>',
	) );
	
	register_sidebar( array(
		'name'         => __( 'Footer - Right' ),
		'id'           => 'footer-right',
		'description'  => __( 'Widgets in this area will be shown on the right hand side of the footer.' ),
		'before_title' => '<h1>',
		'after_title'  => '</h1>',
	) );
}

function neag_sort_by_last_then_first( $a, $b ){	// a and b are people IDs
	setlocale(LC_CTYPE, 'en_US.UTF8'); // Using setlocale and iconv incase a name has an accent or other similar characters in them
	$r = strnatcasecmp( iconv('UTF-8', 'ASCII//TRANSLIT', get_field('last_name', $a)), iconv('UTF-8', 'ASCII//TRANSLIT', get_field('last_name', $b)) );
	if( $r === 0 ){
		$r = strnatcasecmp( iconv('UTF-8', 'ASCII//TRANSLIT', get_field('first_name', $a)), iconv('UTF-8', 'ASCII//TRANSLIT', get_field('first_name', $b)) );
	}
	return $r;
}

function processPosts( $queryPosts, $expertsFlag = false ){
	usort( $queryPosts, 'neag_sort_by_last_then_first' );
	
	$fields = array( 'first_name' => '', 'middle_name' => '', 'last_name' => '', 'title' => '', 'email' => '', 'phone' => '', 'office_location' => '', 'expertise' => '' );

	$alphabet = array_fill_keys( range('A', 'Z'), '' );
	
	$people = array();
	foreach( $queryPosts as $i=>$id ){
		$people[$i] = array();
		
		foreach( $fields as $k=>$v ){
			$fields[$k] = get_field( $k, $id );
		}
		
		$people[$i]['name'] = "{$fields['first_name']} {$fields['middle_name']} {$fields['last_name']}";
		$people[$i]['permalink'] = get_permalink( $id );
		$people[$i]['phone'] = $fields['phone'];
		$people[$i]['title'] = $fields['title'];
		$people[$i]['email'] = $fields['email'];
		$people[$i]['office_location'] = $fields['office_location'];
		$people[$i]['photo'] = get_the_post_thumbnail( $id, array(115, 115) );
		$people[$i]['expertise'] = $fields['expertise'];
		
		$nameLetter = $fields['last_name'][0];	// $fields['last_name'] is a string
		
		$setDivIDFlag = false;
		if( empty( $alphabet[$nameLetter] ) ){
			$setDivIDFlag = true;
			$alphabet[$nameLetter] = true;
		}
		if( $setDivIDFlag == true ){
			$people[$i]['divid'] = $nameLetter;
		} else {
			$people[$i]['divid'] = '';	
		}
	}
	
	return $people;	
}

add_action( 'wp_ajax_neag_get_people', 'neag_get_people_callback' );
add_action( 'wp_ajax_nopriv_neag_get_people', 'neag_get_people_callback' );
function neag_get_people_callback(){
	$categoryID = $_POST['categoryID'];
	
	$args = array(
		'post_type' => array( 'person' ),
		'fields' => 'ids',
		'posts_per_page' => -1,
	);
	
	if( $categoryID != 0 ){
		$termSearch = array();
		$termSearch['taxonomy'] = 'group';
	
		$termSearch['field'] = 'term_id';
		$termSearch['terms'] = $categoryID;
	
		$taxQuery = array( $termSearch );
		$args['tax_query'] = $taxQuery;
	}
	
	$query = new WP_Query( $args );
	$queryPosts = $query->posts;
	
	$people = array();
	
	if( $query->have_posts() ){
		$people = processPosts( $queryPosts );
	}
	
	echo wp_json_encode( $people );
	
	wp_die();
}

if(function_exists("register_field_group"))
{
	register_field_group(array (
		'id' => 'acf_person_neag',
		'title' => 'Person',
		'fields' => array (
			array (
				'key' => 'field_expertise',
				'label' => 'Faculty Area of Expertise',
				'name' => 'expertise',
				'type' => 'text',
				'default_value' => '',
				'placeholder' => '',
				'prepend' => '',
				'append' => '',
				'formatting' => 'html',
				'maxlength' => '',
			),			
		),
		'location' => array (
			array (
				array (
					'param' => 'post_type',
					'operator' => '==',
					'value' => 'person',
					'order_no' => 0,
					'group_no' => 0,
				),
			),
		),
		'options' => array (
			'position' => 'normal',
			'layout' => 'no_box',
			'hide_on_screen' => array (
			),
		),
		'menu_order' => 0,
	));
}
//==================================================
// include authors in search results
//==================================================
/**
 * Include posts from authors in the search results where
 * either their display name or user login matches the query string
 *
 * @author danielbachhuber
 */
add_filter( 'posts_search', 'db_filter_authors_search' );
function db_filter_authors_search( $posts_search ) {
	// Don't modify the query at all if we're not on the search template
	// or if the LIKE is empty
	if ( !is_search() || empty( $posts_search ) )
		return $posts_search;
	global $wpdb;
	// Get all of the users of the blog and see if the search query matches either
	// the display name or the user login
	add_filter( 'pre_user_query', 'db_filter_user_query' );
	$search = sanitize_text_field( get_query_var( 's' ) );
	$args = array(
		'count_total' => false,
		'search' => sprintf( '*%s*', $search ),
		'search_fields' => array(
			'display_name',
			'user_login',
		),
		'fields' => 'ID',
	);
	$matching_users = get_users( $args );
	remove_filter( 'pre_user_query', 'db_filter_user_query' );
	// Don't modify the query if there aren't any matching users
	if ( empty( $matching_users ) )
		return $posts_search;
	// Take a slightly different approach than core where we want all of the posts from these authors
	$posts_search = str_replace( ')))', ")) OR ( {$wpdb->posts}.post_author IN (" . implode( ',', array_map( 'absint', $matching_users ) ) . ") AND {$wpdb->posts}.post_type = 'post'))", $posts_search );
	return $posts_search;
}
/**
 * Modify get_users() to search display_name instead of user_nicename
 */
function db_filter_user_query( &$user_query ) {
	if ( is_object( $user_query ) )
		$user_query->query_where = str_replace( "user_nicename LIKE", "display_name LIKE", $user_query->query_where );
	return $user_query;
}
?>