Code Snippets

Pingbacks and trackbacks are a legacy WordPress mechanism that notifies other sites when you link to them. In practice, most pingbacks are spam and there is no reason to keep the feature enabled. For more on hardening WordPress security.

Disable pingbacks via code – add to functions.php:

add_filter( 'xmlrpc_methods', function( $methods ) {
	unset( $methods['pingback.ping'] );
	unset( $methods['pingback.extensions.getPingbacks'] );
	return $methods;
} );

add_action( 'pre_ping', function( &$links ) {
	$home = get_option( 'home' );
	foreach ( $links as $l => $link ) {
		if ( strpos( $link, $home ) === 0 ) {
			unset( $links[ $l ] );
		}
	}
} );

Also disable the option in Settings > Discussion > uncheck “Allow link notifications from other blogs (pingbacks and trackbacks)”.

If you want to change the currency symbol WooCommerce displays (e.g. replace “$” with “USD” or add a space), add the following code to your functions.php file. For more on WooCommerce hooks.

add_filter( 'woocommerce_currency_symbol', function( $symbol, $currency ) {
	switch ( $currency ) {
		case 'USD':
			$symbol = 'USD ';
			break;
		case 'GBP':
			$symbol = 'GBP ';
			break;
	}
	return $symbol;
}, 10, 2 );

Modify the case and $symbol values to match your needs.

WordPress ships with three WP-Cron intervals: hourly, twicedaily, and daily. If you need a different interval (e.g. every 5 minutes), add the following code. For more on WordPress hooks and filters.

add_filter( 'cron_schedules', function( $schedules ) {
	$schedules['every_five_minutes'] = array(
		'interval' => 300,
		'display'  => 'Every 5 Minutes',
	);
	return $schedules;
} );

// Schedule the event on theme activation
if ( ! wp_next_scheduled( 'my_custom_cron_event' ) ) {
	wp_schedule_event( time(), 'every_five_minutes', 'my_custom_cron_event' );
}

add_action( 'my_custom_cron_event', function() {
	// Your code here
} );

WordPress limits the file size you can upload through the Media Library. The limit is set by PHP settings on the server. Here are three ways to increase it. For more on troubleshooting image upload errors.

Option 1 – .htaccess file:

php_value upload_max_filesize 64M
php_value post_max_size 64M
php_value max_execution_time 300
php_value max_input_time 300

Option 2 – wp-config.php file:

@ini_set( 'upload_max_filesize', '64M' );
@ini_set( 'post_max_size', '64M' );
@ini_set( 'max_execution_time', '300' );

Option 3 – php.ini file:

upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 300

Replace 64M with your desired size.

If you encounter the “Allowed memory size exhausted” error, increase the WordPress memory limit. Add the following lines to your wp-config.php file before the “That’s all, stop editing!” line. For more on optimizing wp-config.php.

define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );

WP_MEMORY_LIMIT affects the frontend and WP_MAX_MEMORY_LIMIT affects the admin area. If the change does not help, your hosting provider may enforce a server-level limit.

If you want to require a minimum order amount in your WooCommerce store, add the following code to your functions.php file. The code displays a notice in the cart and prevents checkout. For more on WooCommerce hooks.

add_action( 'woocommerce_checkout_process', function() {
	$minimum = 50;
	if ( WC()->cart->get_subtotal() < $minimum ) {
		wc_add_notice(
			sprintf( 'The minimum order amount is %s. Your current cart total is %s.',
				wc_price( $minimum ),
				wc_price( WC()->cart->get_subtotal() )
			), 'error'
		);
	}
} );

add_action( 'woocommerce_before_cart', function() {
	$minimum = 50;
	if ( WC()->cart->get_subtotal() < $minimum ) {
		wc_print_notice(
			sprintf( 'The minimum order amount is %s. Please add more products to your cart.',
				wc_price( $minimum )
			), 'notice'
		);
	}
} );

Replace 50 with your desired minimum amount.

WooCommerce displays related products at the bottom of the product page by default. To remove them, add the following code to your functions.php file. For more on WooCommerce hooks.

remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20 );

If you only want to change the number of related products displayed instead of removing them entirely:

add_filter( 'woocommerce_output_related_products_args', function( $args ) {
	$args['posts_per_page'] = 3;
	$args['columns'] = 3;
	return $args;
} );

After installing an SSL certificate, add the following code to your .htaccess file to redirect all traffic from HTTP to HTTPS. For more on migrating your WordPress site to HTTPS.

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Make sure the code is placed at the top of your .htaccess file, before the existing WordPress rules.

WP-Cron runs on every page load, which can cause overhead on high-traffic sites or missed events on low-traffic sites. You can disable it and use a real server cron job instead. For more on optimizing wp-config.php.

Step 1 – Add to wp-config.php:

define( 'DISABLE_WP_CRON', true );

Step 2 – Set up a server cron job (every 5 minutes):

*/5 * * * * wget -q -O /dev/null https://your-domain.com/wp-cron.php?doing_wp_cron >/dev/null 2>&1

Replace your-domain.com with your domain.