Generate a username at PMPro checkout from email for users.

checkout/generate-username-from-email-pmpro.php

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+<?php
+/**
+* Generate a username at PMPro checkout from email for users.
+* includes hiding 'username' field using custom CSS line 67 - 79
+*
+* title: Generate a username at PMPro checkout from email for users.
+* layout: snippet
+* collection: username
+* category: checkout
+* url: https://www.paidmembershipspro.com/customizing-usernames-for-your-membership-site/
+*
+* 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_generate_username_at_checkout() {
+
+	// Make sure PMPro is installed and the function to get the level at checkout exists.
+	if ( ! function_exists( 'pmpro_getLevelAtCheckout' ) ) {
+		return;
+	}
+
+	// check for level as well to make sure we're on checkout page
+	if ( empty( pmpro_getLevelAtCheckout() ) ) {
+		return;
+	}
+
+	if ( ! empty( $_POST['bemail'] ) ) {
+		$_REQUEST['username'] = $_POST['username'] = my_pmpro_generate_username_from_email( $_POST['bemail'] );
+	}
+
+	if ( ! empty( $_GET['bemail'] ) ) {
+		$_REQUEST['username'] = $_GET['username'] = my_pmpro_generate_username_from_email( $_GET['bemail'] );
+	}
+
+}
+add_action( 'init', 'my_pmpro_generate_username_at_checkout' );
+
+/**
+ * Hide the username field on checkout.
+ */
+function my_pmpro_unset_required_username_checkout( $pmpro_required_user_fields ) {
+	unset( $pmpro_required_user_fields['username'] );
+	return $pmpro_required_user_fields;
+}
+add_filter( 'pmpro_required_user_fields', 'my_pmpro_unset_required_username_checkout', 10, 2 );
+
+
+/**
+ * Generate a username from a user's email address.
+ * Helper function.
+ */
+function my_pmpro_generate_username_from_email( $email ) {
+
+	$parts = explode( '@', $email );
+
+	while ( username_exists( $parts[0] ) ) {
+		$parts[0] .= random_int( 0, 9999 );
+	}
+
+	return sanitize_text_field( $parts[0] );
+}
+
+/**
+ * Loads styling in the footer to hide the username field
+ */
+add_action( 'wp_footer', function () {
+    ?>
+    <style>
+        /* Hide the username field on checkout. */
+        .pmpro_form_field-username {
+            display: none !important;
+        }
+    </style>
+    <?php
+} );