Create Add validation for a custom URL user field at checkout

add-validation-for-user-url-checkout-field.php

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+<?php
+/**
+ * This recipe adds validation for a URL User Field at Membership Checkout.
+ * 
+ * title: Add Validation For User URL Field At Checkout
+ * layout: snippet
+ * collection: checkout
+ * category: user fields
+ * link: tbd
+ * 
+ * You can add this recipe to your site by creating a custom plugin
+ * or using the Code Snippets plugin available for free in the WordPress repository.
+ * Read this companion article for step-by-step directions on either method.
+ * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
+ */
+function my_pmpro_check_valid_urls( $pmpro_continue_registration ) {
+	if ( ! $pmpro_continue_registration ) {
+		return $pmpro_continue_registration;
+	}
+
+	$url_fields = array(
+		'user_url'        => 'Website', // replace user_url with the name of your field and Website with your field label
+	);
+
+	$error_messages = array();
+
+	foreach ( $url_fields as $field_name => $label ) {
+		if ( isset( $_REQUEST[ $field_name ] ) ) {
+			$url = sanitize_text_field( $_REQUEST[ $field_name ] );
+
+			if ( ! empty( $url ) && ! preg_match( '/^https?:\/\//i', $url ) ) {
+				$pmpro_continue_registration = false;
+				$error_messages[] = 'Please enter a full URL for "' . esc_html( $label ) . '" starting with http:// or https://'; // Set your preferred starting sentence for the error displayed
+			}
+		}
+	}
+
+	// Show all error messages
+	if ( ! empty( $error_messages ) ) {
+		pmpro_setMessage( implode( '<br>', $error_messages ), 'pmpro_error' );
+	}
+
+	return $pmpro_continue_registration;
+}
+
+add_filter( 'pmpro_registration_checks', 'my_pmpro_check_valid_urls' );