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PHP

"Confirm Email" Field on the Registration Form

Adds a second email field to the WordPress registration form and refuses the sign-up when the two addresses differ, so new users do not lock themselves out with a typo.

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Code

add_action( 'register_form', function () {
    $value = isset( $_POST['wpide_email_confirm'] ) ? sanitize_email( wp_unslash( $_POST['wpide_email_confirm'] ) ) : '';
    printf( '<p><label for="wpide_email_confirm">Confirm email</label><input type="email" name="wpide_email_confirm" id="wpide_email_confirm" class="input" value="%s" size="25" autocomplete="email" required></p>', esc_attr( $value ) );
} );

add_filter( 'registration_errors', function ( $errors, $login, $email ) {
    $confirm = isset( $_POST['wpide_email_confirm'] ) ? sanitize_email( wp_unslash( $_POST['wpide_email_confirm'] ) ) : '';

    if ( strtolower( trim( $confirm ) ) !== strtolower( trim( $email ) ) ) {
        $errors->add( 'wpide_email_mismatch', '<strong>Error:</strong> The email addresses do not match.' );
    }

    return $errors;
}, 10, 3 );

Notes

Applies to the standard wp-login.php?action=register form.

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