WordPress Front-End Ajax Loader

WP-front-end-ajax.php

<?php 
function 3five_wpajax_url_script() {
	$output = '<script type="text/javascript">';
	$output .= 'var ajaxurl = '. admin_url('admin-ajax.php');
	$output .= '</script>';
echo $output;
}

// Enqueue and localize the ajax script for the staff page. 
function 3five_ajax_load_scripts() {        
    wp_enqueue_script('work-ajax', get_template_directory_uri(__FILE__) . '/js/work-ajax.min.js', array('jquery'));
    wp_localize_script('work-ajax', 'work_vars', array(
            '3five_nonce' => wp_create_nonce('3five-nonce')
        )
    );
    3five_wpajax_url_script(); // Loads the admin ajax function.
}
add_action('wp_enqueue_scripts', '3five_ajax_load_scripts');

if ( !function_exists( '3five_ajax' ) ) {
	function( '3five_ajax' ) {

		if( !isset( $_POST['3five_nonce'] ) || !wp_verify_nonce($_POST['3five_nonce'], '3five-nonce') )
        die('Access Denied');
  }
}
?>