Require ACF

require-acf.php

<?php
/*** Require  ACF plugin ***/

//Check if ACf exists on plugin activation
register_activation_hook( __FILE__, 'acf_plugin_activation' );
function acf_plugin_activation(){

    // Require ACF or ACF Pro plugin
    if ( ( !is_plugin_active( 'advanced-custom-fields/acf.php' ) && !is_plugin_active( 'advanced-custom-fields-pro/acf.php' ) ) and current_user_can( 'activate_plugins' ) ) {
        // Stop activation redirect and show error
        wp_die('Sorry, but this plugin requires the ACF or ACF Pro Plugin to be installed and active. <br><a href="' . admin_url( 'plugins.php' ) . '">&laquo; Return to Plugins</a>');
    }
}

//Check if ACF or ACF Pro is installed and activated
add_action( 'admin_init', 'acf_plugin_check' );
function acf_plugin_check() {
    if ( is_admin() && current_user_can( 'activate_plugins' ) &&  !is_plugin_active( 'advanced-custom-fields/acf.php' ) && !is_plugin_active( 'advanced-custom-fields-pro/acf.php' ) ) {
        add_action( 'admin_notices', 'acf_plugin_notice' );

        deactivate_plugins( plugin_basename( __FILE__ ) ); 

        if ( isset( $_GET['activate'] ) ) {
            unset( $_GET['activate'] );
        }
    }
}

//User notice that ACF is required
function acf_plugin_notice(){
    ?><div class="error"><p>Sorry, but Plugin requires the ACF or ACR Pro plugin to be installed and active.</p></div><?php
}