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Convert capital letters to lowercase and replace spaces with underscores "_" in order to standardize usernames.
<?php // Do not copy this tag.
/**
* Convert capital letters to lowercase and replace all spaces with an underscore when
* new users register for Paid Memberships Pro.
* Add this code to your PMPro Customizations Plugin -
* https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
*/
function my_custom_user_registration_changes( $userdata ) {
$userdata['user_login'] = str_replace(' ', '_', strtolower( $userdata['user_login'] ) );
return $userdata;
}
add_filter( 'pmpro_checkout_new_user_array', 'my_custom_user_registration_changes', 10, 1 );
@laurenhagan0306
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This recipe is included in the blog post "Reformat usernames to use allowed characters after checkout." at Paid Memberships Pro here: https://www.paidmembershipspro.com/reformat-usernames-to-use-allowed-characters-after-checkout/

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