Including ACF in functions.php (WordPress)

You need to make sure your includes won't collide with ACF itself or someone else's plugin that also uses it.

if( !class_exists('Acf') )    include_once('external/acf/acf.php' );if( !class_exists('acf_repeater_plugin') )    include_once('external/acf-repeater/acf-repeater.php');if( !class_exists('acf_options_page_plugin') )    include_once('external/acf-options-page/acf-options-page.php');

There are only Four steps to include ACF in functions.php

    /***********************************************************    *               Integrate ACF in theme    ***********************************************************/    // 1. customize ACF path    add_filter('acf/settings/path', 'my_acf_settings_path');     function my_acf_settings_path( $path ) {         // update path        $path = get_stylesheet_directory() . '/framework/acf/';            // return        return $path;        }     // 2. customize ACF dir    add_filter('acf/settings/dir', 'my_acf_settings_dir');     function my_acf_settings_dir( $dir ) {         // update path        $dir = get_stylesheet_directory_uri() . '/framework/acf/';            // return        return $dir;        }     // 3. Hide ACF field group menu item    add_filter('acf/settings/show_admin', '__return_false');    // 4. Include ACF    include_once( get_stylesheet_directory() . '/framework/acf/acf.php' );    // including acf fields    require_once( get_template_directory() . '/framework/acf-fields.php' );