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<?php
function username_exists( $username ) {
    if ( $user = get_user_by('login', $username ) ) {
        return $user->ID;
    } else {
        return null;
    }
}
?>

• Function Reference/username exists « WordPress Codex
  Description. Returns the user ID if the user exists or null if the user doesn't exist. Note: To execute this function you will need to add this line of code: ...
  codex.wordpress.org
• Nino (@Username_exists) on Twitter
  Sign up for Twitter to follow Nino (@Username_exists). Struggling PolSci student, part-time Bundestag staffer, subprofessional Photographer, wannabe ...
  twitter.com
• eMember - Fatal error: Call to undefined function username_exists ...
  I was using an earlier version of wp-emember (v5) with no issues up until quite recently and noticed for some strange reason it wasn't working ...
  www.tipsandtricks-hq.com
• wp_create_user & username_exists
  This may be a silly question, and I may end up not even using it, but... I have a scenario (shopping cart) where I want to automate the user ...
  www.wptavern.com

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