Hide ACF Menu from Clients

authorized-acf-access.php

/**
 * A method to really block access to ACF menu
 * http://www.advancedcustomfields.com/docs/tutorials/hide-acf-menu-from-clients/
 */

/**
 * Remove ACF menu item from the admin menu
 */
 
add_action( 'admin_menu', 'acf_remove_menu_page', 15 );

function acf_remove_menu_page() 
{
	global $current_user;
	get_currentuserinfo();
 
	if( 'admin' != $current_user->user_login )
	{
		remove_menu_page( 'edit.php?post_type=acf' ); 
	}
}

/**
 * Prevent unauthorized access to ACF menus
 */
 
add_action( 'admin_head', 'acf_prevent_url_access' );

function acf_prevent_url_access()
{
	global $current_screen, $current_user;
	
	// Not our pages, exit earlier
	if( 'edit-acf' != $current_screen->id && 'custom-fields_page_acf-settings' != $current_screen->id )
		return;
	
	// Authorized user, exit earlier
	if( $current_user->user_login == 'admin' )
		return;
		
	// User not authorized to access page, redirect to dashboard
	wp_redirect( admin_url() ); 
	exit;
}

In the "acf_prevent_url_access" function, we got an error with the wp_redirect( admin_url() ) - header information can’t be modified