Boopathi Rajan

By default WordPress having an function called count_users() to get count of users having each role, as well as the count of all users.
Check below example code for your reference.

$result = count_users();
echo 'There are ', $result['total_users'], ' total users';
foreach($result['avail_roles'] as $role => $count)
    echo ', ', $count, ' are ', $role, 's';
echo '.';

Please feel free to contact me if you need any further information.

To disable email notification after password change, Add the following code in your theme file or plugin files.

/* To disable email notification after password change */
add_filter( 'send_password_change_email', '__return_false' );

Please feel free to contact me if you need any further information.

By default WordPress having an function called get_cat_ID() to retrieve get category ID from category name. Please check the below sample code for how to get category ID from category name in WordPress. Replace ‘Category Name’ with your category name.

$categoryID = get_cat_ID('Category Name');

If you have any doubt, Please comment here.

We can retrieve list of all sites in WordPress Multisite Network by using get_sites() function.
This function will return the data in array format. Please check the sample code below.

$sites = get_sites();
var_dump($sites);

If you have any doubt, Please comment here.

We can retrieve list of themes with theme data by using wp_get_themes() function.
This function will return the data in array. Please check the sample code below.

$themes = wp_get_themes();
var_dump($themes);

If you have any doubt, Please comment here.

You can get get count of posts in a particular category by using below code. Before use please replace “CUSTOM_POST_TYPE” and “CUSTOM_TAXONOMY” with your post type and taxonomy.

$the_query = new WP_Query( array(
    'post_type' => 'CUSTOM_POST_TYPE',
    'tax_query' => array(
        array(
            'taxonomy' => 'CUSTOM_TAXONOMY',
            'field' => 'id',
            'terms' => TERM_ID
        )
    )
) );
$count = $the_query->found_posts;

Have any doubt please comment here.

If you want to get the count of posts in wordpress archive page, You can by 2 ways.

First option is

$count = $GLOBALS['wp_query']->post_count;

Another option is

$count = $GLOBALS['wp_query']->found_posts;

Have any doubt please comment here.

For redirect non admin users to home page and disallow back end access in WordPress, you need to simply copy and paste the following code in your theme’s functions.php file.

function redirect_non_admin_user(){
    if ( !defined( 'DOING_AJAX' ) && !current_user_can('administrator') ){
        wp_redirect( site_url() );  exit;
    } 
}
add_action( 'admin_init', 'redirect_non_admin_user' );

Have any doubt, then comment here!

To disable WooCommerce Payment methods based on cart item quantity, you need to simply copy and paste the following code in your theme’s functions.php file.
Here I’m unsetting the COD when cart item quantity limit reached 10.

add_filter('woocommerce_available_payment_gateways', 'disable_payment_gateway_based_on_quantity', 10, 1);
function disable_payment_gateway_based_on_quantity( $available_gateways ) 
{
    $qty_limit = 10;
    $limit_reached = false;
    foreach(WC()->cart->get_cart() as $cart_item){
        if($cart_item['quantity'] > $qty_limit ){
            $limit_reached = true;
            break;
        }
    }
    if($limit_reached){
        unset($available_gateways['cod']);
    }
    return $available_gateways;
}

You can use the same code for disable WooCommerce Payment methods based on cart item quantity. Change quantity and payment method slug for your needs.

Have any doubt, then comment here!

You can check whether the folder is exits or not by using file_exists(). You can also create folder by using mkdir(). See below example code to create folder if it doesn’t already exits in PHP.

if (!file_exists('path/to/directory')) {
    mkdir('path/to/directory', 0777, true);
}

Have any doubt, then comment here!