A method to enqueue and auto version CSS and JavaScript in WordPress.

functions.php

<?php
/**
 * Auto-versioning CSS and JavaScript in WordPress
 * @author Eric Binnion
 * http://manofhustle.com
 */ 
 
add_action("wp_enqueue_scripts", "auto_version_scripts", 20);
function auto_version_scripts() {
    // Get last modified timestamp of CSS file in /css/style.css
    $ctime = template_directory() . '/css/style.css' );

    // Get last modified timestamp of JS file in /js/main.js
    $jtime = template_directory() . '/js/main.js' );

    wp_enqueue_style(
      'custom_style', // handle for style.css
      get_template_directory_uri() .'/css/style.css' ,
      array(), // dependencies
      $ctime, // version number
      true // load in footer
    );

    wp_enqueue_script(
      'custom_js', // handle for main.js
      get_template_directory_uri() .'/js/main.js' ,
      array(), // dependencies
      $time, // version number
      true // load in footer
    );
}

Hi,
at rows 11 and 14 there seems to be a syntax error. At the end there is a closed parenthesis. Also the function "template_directory" doesn't exist.

I think the correct version would be:
$ctime = filemtime(get_template_directory() . '/css/style.css' );

Anyway thanks, this was useful